Secondary Battery Sealing Tape Electrolyte Directionality

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Secondary batteries face issues with the movement of electrode assemblies within cylindrical cans due to vibrations or impacts, leading to increased internal resistance and potential damage to electrode tabs, which existing technologies fail to adequately prevent.

Innovation Solution

A secondary battery design that incorporates a sealing tape with a base sheet that loses directionality and changes shape upon contact with electrolyte, attached to the electrode assembly, which increases frictional contact with the can's inner surface, preventing movement and stabilizing the assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sealing tape with directionality-maintaining base sheet is used, then the structural integrity of the electrode assembly is maintained, but the electrode assembly moves within the can due to vibrations or impacts

Engineering Contradiction:

Improvestability of electrode assemblyVSAvoidmovement of electrode assembly

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The base sheet material undergoes a parameter change in its directional properties when exposed to electrolyte. The base sheet transitions from a directional state (maintaining structural integrity) to a non-directional state (increasing friction with can inner surface), thereby preventing electrode assembly movement while preserving structural stability.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If the base sheet is made thicker to prevent movement, then frictional contact with the can increases, but the manufacturing complexity and material usage increase

Engineering Contradiction:

Improveprevention of electrode assembly movementVSAvoidcomplexity of sealing tape structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Instead of increasing thickness, the invention changes the directional parameter of the existing base sheet material through electrolyte exposure. This parameter change enables the base sheet to increase friction and prevent movement without requiring additional material or structural complexity.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a rigid sealing structure is used to prevent movement, then the electrode assembly is stabilized, but the battery cannot accommodate electrolyte infiltration and swelling

Engineering Contradiction:

Improvestability of electrode assemblyVSAvoidadaptability to electrolyte infiltration

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The sealing tape is designed with dynamic properties that allow it to adapt to different states. The base sheet transitions from a rigid directional structure to a flexible non-directional structure when exposed to electrolyte, enabling the sealing tape to accommodate electrolyte infiltration and electrode swelling while maintaining stability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The base sheet material undergoes a parameter change in its mechanical properties when exposed to electrolyte, transitioning from a rigid directional state to a flexible non-directional state. This enables the sealing tape to adapt to electrolyte infiltration and electrode assembly swelling while preventing harmful movement.

Inventive Principle:

Principle #35Parameter changes

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 prevents relative movement of the electrode assembly within the can, reducing internal resistance and potential damage, while maintaining chemical stability of the electrolyte and ensuring stable battery operation.

Implementation Method 1

the base layer is configured to at least partially lose directionality upon contacting the electrolyte so that at least a portion of the base layer contacts an inner surface of the can

Methodology Applied

Scientific EffectLoss of directionality:

Data Source

PatentUS8048559B2Secondary battery and method of making the secondary battery

Publication Date: 2011.11.01 SAMSUNG SDI CO LTD

AI summary

A secondary battery and a manufacturing method thereof are disclosed. In one embodiment, the secondary battery includes 1) an electrode assembly comprising an outer surface, 2) an electrolyte, 3) a sealing tape attached to and surrounding at least part of the outer surface of the electrode assembly, wherein the sealing tape comprises i) an adhesive layer contacting the outer surface of the electrode assembly and ii) a base layer formed on the adhesive layer, and wherein the base layer is formed of a material which has directionality and 4) a can accommodating the electrode assembly and sealing tape, wherein the base layer is configured to at least partially lose directionality upon contacting the electrolyte so that at least a portion of the base layer contacts an inner surface of the can.