Wound Secondary Battery Insulation for Foreign Matter Short Prevention
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Solution Overview
Problem
Existing secondary batteries face safety concerns due to potential internal short circuits caused by foreign matter trapped between the positive and negative electrodes, which can lead to structural damage and instability.
Innovation Solution
The secondary battery design incorporates an insulating layer with an elongation of 180% or higher between the positive and negative electrode current collector exposed regions, preventing the insulating layer from breaking or cracking even when foreign matter is trapped, thereby enhancing safety by reducing the risk of internal short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulating layer is used between electrodes, then the structure is simple and easy to manufacture, but the insulating layer may break or crack when foreign matter is trapped, leading to internal short circuits
Solution Approach 1:
The patent applies parameter changes by specifying that the insulating layer must have an elongation of 180% or higher. This quantitative parameter change transforms the insulating layer from a conventional rigid component into a highly flexible protective layer that can deform without breaking when foreign matter is trapped between electrodes, thereby preventing internal short circuits while maintaining manufacturing feasibility.
Solution Approach 2:
The patent implements beforehand cushioning by providing an insulating layer with exceptional elongation properties that acts as a cushioning barrier between the positive and negative electrodes. This layer is designed to absorb and distribute mechanical stress before it can cause damage, preventing foreign matter from penetrating through and causing short circuits during battery assembly or operation.
2Reliability
If the insulating layer has high elongation to prevent breaking, then safety improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a clear quantitative parameter (elongation of 180% or higher) that provides manufacturers with a definitive target for material selection and processing. This parameter specification, while demanding, creates a measurable quality standard that enables consistent manufacturing through controlled material properties rather than requiring complex assembly precision.
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 insulating layer effectively prevents internal short circuits and structural damage, ensuring superior safety and stability of the battery even under impact conditions.
Implementation Method 1
the insulating layer that covers the opposing part, of the positive electrode current collector exposed region, that is opposed to the negative electrode active material layer with the separator interposed therebetween, has an elongation of 180% or higher
Data Source
AI summary
A secondary battery is provided and includes an electrode wound body includes a first end face and a second end face. The first end face faces a positive electrode current collector plate in a height direction. The second end face faces a negative electrode current collector plate in the height direction. A positive electrode includes a positive electrode current collector covered region and a positive electrode current collector exposed region. The positive electrode current collector covered region is a region in which a positive electrode current collector is covered with a positive electrode active material layer. The positive electrode current collector exposed region is a region in which the positive electrode current collector is exposed without being covered with the positive electrode active material layer. All or a part of the positive electrode current collector exposed region forms the first end face and is coupled to the positive electrode current collector plate. A negative electrode includes a negative electrode current collector covered region and a negative electrode current collector exposed region. The negative electrode current collector covered region is a region in which a negative electrode current collector is covered with a negative electrode active material layer. The negative electrode current collector exposed region is a region in which the negative electrode current collector is exposed without being covered with the negative electrode active material layer. All or a part of the negative electrode current collector exposed region forms the second end face and is coupled to the negative electrode current collector plate. The positive electrode includes an insulating layer that covers an opposing part, of the positive electrode current collector exposed region, that is opposed to the negative electrode active material layer with a separator interposed therebetween. The insulating layer has an elongation of 180 percent or higher.