Electrode, method of manufacturing electrode, and battery
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Solution Overview
Problem
Current battery technologies face challenges in achieving superior capacity characteristics, safety, and manufacturing stability, particularly due to issues with electrode design and manufacturing processes that lead to short circuits and inefficient energy density.
Innovation Solution
The introduction of a protective member with unadhered and adhered parts on the electrode body, where the unadhered part is closer to the end face and not adhered to the electrode, while the adhered part is farther and coupled to the electrode, allowing for improved protection and stability during manufacturing and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tape is applied to the electrode and folded back to cover the front surface and back surface, then the electrode is protected, but the cutting process becomes complex and may cause short circuits
Solution Approach 1:
The protective member is divided into three distinct parts: a first protective member covering the front surface, a second protective member covering the back surface, and a third protective member bridging between them. This segmentation allows each part to be independently positioned and removed, simplifying the cutting process while maintaining comprehensive protection during manufacturing.
Solution Approach 2:
The protective members are applied to the electrode body before the cutting process. The first and second protective members are positioned on opposite surfaces, and the third protective member connects them, establishing a protective framework in advance that guides the cutting operation and prevents short circuits during the subsequent cutting step.
2Strength
If the protective member is fully adhered to the electrode body, then strong bonding is achieved, but cutting together with the electrode becomes difficult
Solution Approach 1:
The adhesive layer is selectively applied only to specific regions of the protective member rather than the entire surface. The first and second protective members have adhesive layers on their respective bonding surfaces, while the third protective member has adhesive layers only at its ends that contact the first and second protective members. This localized adhesion provides sufficient bonding strength while allowing clean separation during cutting.
Solution Approach 2:
The protective member structure is segmented into multiple parts with discrete adhesive applications. The first, second, and third protective members are connected through localized adhesive bonds rather than continuous adhesion, enabling the structure to maintain strength during assembly while facilitating clean separation during the cutting process.
3Reliability
If the adhesive layer width matches the electrode width, then full coverage is achieved, but excess adhesive causes manufacturing defects
Solution Approach 1:
The adhesive layer is applied with precise dimensional control, matching the width of the electrode body exactly. This localized precision application ensures complete coverage of the electrode surface without excess adhesive extending beyond the electrode edges, thereby preventing manufacturing defects such as adhesive contamination or short circuits.
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 configuration enhances the battery's capacity characteristics, safety by preventing short circuits, and manufacturing stability by facilitating smooth cutting and assembly processes, resulting in higher energy density and reduced defects.
Implementation Method 1
The protective member includes a base layer and an adhesive layer. The adhesive layer is provided on a surface of the base layer opposite to the other surface of the base layer. The unadhered part is unadhered to the electrode body, and the adhered part is adhered to the electrode body
Data Source
AI summary
An electrode includes an electrode body and a protective member. The protective member covers a surface of the electrode body. The electrode body includes a current collector and an active material layer. The current collector has a first end face. The active material layer is provided on at least a portion of a surface of the current collector. The protective member includes an unadhered part and an adhered part. The unadhered part is disposed on a side closer to the first end face and is unadhered to the electrode body. The adhered part is disposed on a side farther from the first end face, is coupled to the unadhered part, and is adhered to the electrode body.