Electrode Stack Spacers for Faster 3D Battery Assembly
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Solution Overview
Problem
The production of three-dimensional secondary batteries faces challenges in manufacturing efficiency, cost, and maintaining battery capacity and longevity, as existing techniques often result in increased defects and reduced performance when trying to speed up the process.
Innovation Solution
A system for producing electrode components involves unwinding and processing webs of electrode material through a series of stations, including splicing, laser ablation, and cutting, to create precision electrodes with spacer members, allowing for faster manufacturing while maintaining battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precision manufacturing techniques are used to produce three-dimensional secondary batteries, then battery cycle life and longevity are improved, but productivity and manufacturing cost deteriorate
Solution Approach 1:
The electrode assembly is divided into multiple unit cells stacked in the longitudinal direction, with each unit cell containing a complete set of electrodes and separators. This segmentation allows for standardized mass production of individual units that can be quickly assembled, improving productivity while maintaining quality through consistent manufacturing processes for each segment.
Solution Approach 2:
Spacer members are pre-positioned at specific locations within the unit cells before final assembly. This preliminary placement ensures proper electrode spacing and alignment is achieved automatically during stacking, eliminating the need for complex real-time adjustment mechanisms and thereby improving manufacturing speed without sacrificing precision.
2Productivity
If known manufacturing techniques are sped up to increase productivity, then manufacturing speed is improved, but an increased number of defects, loss of capacity and reduced battery longevity result
Solution Approach 1:
The spacer members are designed to automatically maintain proper spacing and alignment between electrodes during the stacking process. This self-aligning mechanism ensures consistent positioning without requiring complex external guidance systems, allowing high-speed manufacturing while maintaining low defect rates through inherent process stability.
Solution Approach 2:
The invention transitions from continuous web processing to discrete unit cell stacking with standardized dimensions. This parameter change enables the use of high-speed automated stacking equipment while maintaining precision through fixed geometric parameters, thereby increasing productivity without compromising quality.
3Quantity of substance
If three-dimensional battery architecture is implemented, then battery capacity is increased, but manufacturing complexity and cost increase
Solution Approach 1:
The three-dimensional electrode assembly is segmented into standardized unit cells that can be manufactured using conventional two-dimensional techniques. Each unit cell contains all necessary components (electrodes, separators, spacers) in a compact stack, which can then be rapidly assembled in three-dimensional configurations. This segmentation reduces manufacturing complexity by breaking down the complex 3D structure into simpler, repeatable units.
Solution Approach 2:
Multiple functional elements (electrodes, separators, and spacers) are merged into a single integrated unit cell structure. This consolidation allows all components to be manufactured and pre-assembled together using standard processes, then stacked to create the final three-dimensional battery. The merging approach reduces overall manufacturing complexity by eliminating the need for separate handling and assembly of each component type.
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 enhances the speed of electrode production while retaining or improving battery capacity and longevity, reducing defects, and achieving efficient assembly of three-dimensional secondary batteries.
Implementation Method 1
laser ablation, and cutting, to create precision electrodes
Data Source
AI summary
A battery includes an electrode assembly. The electrode assembly has a population of unit cells, each unit cell including an electrode current collector layer, an electrode layer, a separator layer, a counter-electrode layer, and a counter-electrode current collector layer in stacked succession. The electrode layer has an electrode active material, and the counter-electrode layer has a counter-electrode active material. One of the electrode active material and the counter-electrode material is a cathodically active material and the other of the electrode active material and the counter-electrode material is an anodically active material. A subset of the unit cell population includes a pair of spacer members located between the electrode current collector layer and the counter-electrode current collector layer. At least a portion of the counter-electrode active material is located between the spacer members in a common plane defined by the x and z axes.