Secondary Battery Electrode Assembly Using Dissolvable Adhesive Dots
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Solution Overview
Problem
During the manufacturing of secondary batteries, electrodes and separators often shift from their desired positions due to high-temperature heat and high-pressure lamination processes, leading to defects and increased production costs, and the use of low-temperature, low-pressure adhesives is expensive and inefficient.
Innovation Solution
A method involving the application of an adhesive to the electrodes and separators, which is then dissolved into the electrolyte solution, allowing the electrodes and separators to adhere without the need for high-pressure lamination, using an acrylate-based adhesive and an organic solvent, and applying the adhesive in a pattern of spaced dots to secure the electrodes and separators in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature heat and high-pressure lamination process is used to bond electrodes and separators, then bonding strength is improved, but electrode and separator shifting occurs leading to defects
Solution Approach 1:
The patent changes the bonding parameters from high-temperature and high-pressure conditions to low-temperature and low-pressure conditions by using adhesive dots. The adhesive provides sufficient bonding strength without requiring extreme thermal and mechanical parameters, thus preventing electrode shifting while maintaining bonding integrity.
Solution Approach 2:
The patent divides the bonding process into discrete adhesive dots rather than continuous lamination. These spaced dots are applied at specific locations to secure electrodes and separators, providing localized bonding that prevents shifting without the need for comprehensive high-pressure lamination across the entire surface.
2Manufacturing precision
If low-temperature, low-pressure adhesive is used to bond electrodes and separators, then manufacturing cost increases and process efficiency decreases, but electrode shifting is prevented
Solution Approach 1:
The patent uses segmented adhesive dots instead of continuous adhesive application. This segmentation reduces the total amount of adhesive required and simplifies the bonding process, maintaining position accuracy while improving process efficiency compared to conventional continuous lamination methods.
Solution Approach 2:
The patent applies adhesive with specific local quality characteristics - using dots of controlled size and spacing at critical locations rather than uniform coverage. This localized approach ensures adequate bonding and position prevention while reducing material usage and process complexity, thereby improving efficiency.
3Ease of manufacture
If adhesive is applied to bond electrodes and separators, then bonding is achieved without high-pressure lamination, but adhesive residue on electrode surfaces may deteriorate battery performance
Solution Approach 1:
The patent uses segmented adhesive dots with sufficient spacing between them. This segmentation minimizes the total adhesive surface area in contact with electrodes, reducing the likelihood of performance deterioration while maintaining bonding effectiveness at critical attachment points.
Solution Approach 2:
The patent employs adhesive dots that are designed to be minimal and temporary in their functional presence. The dots provide necessary bonding during manufacturing but are kept to the minimum extent required, reducing their potential harmful impact on battery performance while maintaining ease of manufacture.
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 method prevents electrode and separator movement during manufacturing, reduces defect rates, and maintains battery performance by ensuring the adhesive does not remain on the electrodes' surfaces, thus avoiding performance deterioration.
Implementation Method 1
dissolving at least a portion of the adhesive into the electrolyte solution
Data Source
AI summary
A method for manufacturing a secondary battery includes: assembling an electrode assembly having a plurality of electrodes separated by at least one separator positioned between each of the electrodes; sealing the electrode assembly and an electrolyte solution in a battery case; and dissolving at least a portion of an adhesive into the electrolyte solution such that a mark from the adhesive is left on the separator. The step of assembling the electrode assembly includes adhering a first one of the plurality of electrodes to the at least one separator with the adhesive positioned between the first electrode and the separator. A secondary battery manufactured by such method is also provided.