Electrode Assembly Edge Coating for Secondary Battery Short Circuit Prevention
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Solution Overview
Problem
Lithium secondary batteries face internal short circuits due to deformation under overcharging conditions, leading to instability and potential ignition.
Innovation Solution
An electrode assembly with a separation membrane and insulating metal oxide coatings on the edge portions of the electrodes to prevent short circuits, using metal oxides like aluminum, silicon, or titanium to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium secondary batteries are used to provide high output against capacity, then power density is improved, but internal stability deteriorates due to overheating and short circuits under overcharging conditions
Solution Approach 1:
An insulating member made of metal oxide material is introduced as an intermediary between the electrolyte and the electrode edges. This intermediary layer prevents direct contact and potential short circuits between electrodes while allowing the high-power lithium secondary battery to operate safely under overcharging conditions.
Solution Approach 2:
The insulating member is pre-applied to the electrode edges before battery assembly to prevent the harmful effect of short circuits. This preliminary protective action counteracts the potential overheating and deformation issues that occur during overcharging, maintaining internal stability while preserving high power output capability.
2Reliability
If insulating members are coated on edge portions of electrodes to prevent short circuits, then reliability is improved, but device complexity increases
Solution Approach 1:
The insulating member is applied only to the edge portions of the electrodes where short circuits are most likely to occur, rather than coating the entire electrode surface. This localized application maintains reliability while minimizing the increase in manufacturing complexity and material usage.
Solution Approach 2:
The insulating member uses metal oxide material with specific physical and chemical properties that provide effective insulation with minimal thickness. By optimizing the material parameters, the coating can be applied in a controlled manner that prevents short circuits without significantly complicating the manufacturing process.
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 internal short circuits and enhances the stability of the electrode assembly, reducing manufacturing time and costs while ensuring safety against overcharging.
Implementation Method 1
a first coating unit having an insulating member which is made of a metal oxide material and is coated along front and rear edge portions of the first electrode unit
Data Source
AI summary
Provided is an electrode assembly of a secondary battery, including: a first electrode unit and a second electrode unit; a separation membrane interposed between the first electrode unit and the second electrode unit; and a first coating unit having an insulating member which is made of a metal oxide material and is coated along front and rear edge portions of the first electrode unit.