Wound Battery Separator Adhesive Pattern for Stable Electrode Spacing
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Solution Overview
Problem
Conventional battery manufacturing techniques waste adhesive by applying it to the entire surface of separators, leading to inefficient adhesion and increased costs, as heat and load concentration on active material layers neglect regions without facing them, such as the ends of the winding axis direction.
Innovation Solution
A battery design where at least one separator has an adhesive layer on one surface with non-formation regions at the ends in the winding axis direction, reducing unnecessary adhesive usage and enhancing adhesion between electrodes, thereby improving inter-electrode distance consistency and vibration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive layer is formed on entire surface of separator, then adhesion function is achieved, but adhesive cost increases and adhesion efficiency decreases
Solution Approach 1:
The adhesive layer is selectively formed only in regions where active material layers are located, rather than covering the entire separator surface. This local quality approach ensures adhesion is achieved precisely where needed (between separator and active material layers) while avoiding unnecessary adhesive application in non-active regions, thereby reducing adhesive cost and improving adhesion efficiency.
Solution Approach 2:
Instead of applying adhesive to the entire separator surface (excessive action), the invention applies adhesive only to the necessary regions where active material layers contact the separator (partial action). This partial application achieves the required adhesion function without wasting adhesive material, directly addressing the cost and efficiency problem.
2Reliability
If heat and load are applied during pressing, then adhesion is enhanced, but heat and load concentrate on active material layers and end regions are neglected
Solution Approach 1:
The adhesive layer is applied locally only in regions where active material layers are positioned on the separator. During heat and load pressing, this localized adhesive application ensures that thermal and mechanical energy are concentrated where adhesion is needed, preventing both excessive concentration on thick active material regions and neglect of end regions, thereby achieving uniform adhesion across all critical areas.
3Area of stationary object
If adhesive is applied to entire separator surface, then coverage is maximized, but manufacturing cost increases
Solution Approach 1:
The adhesive layer is formed selectively in specific regions corresponding to active material layer positions rather than covering the entire separator surface. This approach maintains sufficient adhesive coverage area to achieve effective adhesion between separator and electrodes while significantly reducing adhesive material consumption and manufacturing cost.
Solution Approach 2:
The invention applies adhesive only to the extent necessary for achieving adhesion function (partial action), rather than applying it to the entire separator surface (excessive action). This partial application reduces adhesive usage and manufacturing cost while maintaining adequate coverage in the regions that require adhesion.
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
This design reduces manufacturing costs by optimizing adhesive usage, ensures effective adhesion and separation, and enhances battery performance by minimizing foreign substance mixing and improving vibration resistance.
Implementation Method 1
an adhesive layer on at least one surface... the separator can be unified with at least one of the positive electrode and the negative electrode
Data Source
AI summary
A battery disclosed herein includes a wound electrode body in which a positive electrode and a negative electrode are wound through a separator. The separator includes the adhesive layer on at least one surface, and on the one surface, a non-formation region where the adhesive layer is not formed is provided in at least one end part in a winding axis direction.