Insulating Frame Structure for Electrochemical Cell Separator Isolation
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Solution Overview
Problem
Conventional electrochemical cells require a complex structure to prevent short circuits between the electrode layers and metal separators, necessitating precise adjustment of sealing portions for effective insulation.
Innovation Solution
Incorporating a frame body with electronic insulating properties around the current collector layer and a bonding layer with specific thermal expansion coefficients, along with a sealing portion to simplify insulation and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing portion is used to prevent short circuits between electrode layers and metal separator, then insulation reliability is improved, but device complexity increases due to complicated structure and precise size/position adjustment requirements
Solution Approach 1:
An electronically insulating frame body is introduced as an intermediary component between the current collector layer and the metal separator. This frame body physically separates and electrically insulates the electrode assembly from the metal separator, preventing short circuits without requiring complex sealing portions with precise dimensional adjustments.
Solution Approach 2:
The insulating structure is segmented into distinct functional components: the frame body that provides structural support and electrical insulation, and the bonding layer that attaches the frame body to the current collector layer. This segmentation allows each component to be optimized independently for its specific function.
2Device complexity
If a frame body with bonding layer is introduced to simplify insulation, then device complexity is reduced, but manufacturing precision requirements increase due to thermal expansion coefficient matching
Solution Approach 1:
The bonding layer's thermal expansion coefficient is specifically controlled to fall between the thermal expansion coefficients of the current collector layer and the frame body. This parameter optimization ensures that during temperature variations, the bonding layer accommodates differential thermal expansion without generating excessive stress that would compromise the bonding or cause deformation.
Solution Approach 2:
The bonding layer is designed as a composite material or specially formulated substance that achieves the intermediate thermal expansion coefficient property. This composite approach allows tuning of thermal properties to match the requirements of the assembled structure, bridging the thermal expansion gap between dissimilar materials.
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
Facilitates easy insulation of the electrochemical cell from the metal separator, improving structural strength and gas efficiency while reducing the complexity of the sealing mechanism.
Implementation Method 1
a thermal expansion coefficient of the bonding layer is between a thermal expansion coefficient of the current collector layer and a thermal expansion coefficient of the frame body
Data Source
AI summary
An electrochemical cell includes a current collector layer; a frame body surrounding a side periphery of the current collector layer and having electronic insulating properties, a first electrode layer disposed on the current collector layer, an electrolyte layer disposed on the first electrode layer; and a second electrode layer disposed on an opposite side to the first electrode layer with respect to the electrolyte layer.