Roll-Type Electrode Tape Layout for Battery Deformation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Nonaqueous electrolyte secondary batteries face the challenge of electrode plate deformation during charge-discharge cycles, which can lead to internal short-circuits due to pressure from the battery case, necessitating a solution to suppress such deformation.
Innovation Solution
A roll-type electrode group with a tape attached to the outermost circumferential surface, featuring adhesion regions and a non-adhesion region that straddles the rolling-end edges of the electrode active material layers, reducing stress concentration and preventing excessive thickness increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a tape with adhesive layer is attached to the outermost circumferential surface of the electrode group to fix it, then the electrode group is secured, but the thickness of the electrode group increases excessively and stress concentrates causing electrode plate deformation
Solution Approach 1:
The tape is divided into multiple regions along the rolling direction: adhesion regions at both ends for securing the electrode group, and a non-adhesion region in the middle that prevents excessive thickness increase. This segmentation allows different portions of the tape to serve different functions - fixing the electrode group while avoiding stress concentration at the rolling-end edges
Solution Approach 2:
Different regions of the tape have different properties: the adhesion regions have adhesive layers for strong bonding to secure the electrode group, while the non-adhesion region has no adhesive layer to minimize thickness increase and prevent stress concentration. This local differentiation of properties resolves the contradiction between fixation stability and shape maintenance
2Stability of the object's composition
If a tape is attached to the outermost circumferential surface of the electrode group, then the electrode group is fixed, but stress concentrates on part of the electrode group causing electrode plate deformation that may lead to internal short-circuit
Solution Approach 1:
The tape is segmented into adhesion regions at the ends and a non-adhesion region in the middle. This segmentation prevents stress concentration by ensuring the rolling-end edges are not located at the thickest portion of the taped electrode group, thereby maintaining electrode plate reliability while achieving stable fixation
Solution Approach 2:
The non-adhesion region is strategically positioned to create local thickness variation that prevents stress concentration at critical locations (rolling-end edges), while the adhesion regions provide local strong bonding for fixation. This local quality differentiation protects against electrode plate deformation and internal 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
The configuration effectively suppresses electrode plate deformation, preventing internal short-circuits by distributing stress evenly and maintaining the electrode group's thickness, thereby enhancing the battery's reliability.
Implementation Method 1
the tape has two adhesion regions including a base material layer and an adhesive layer
Data Source
AI summary
A nonaqueous electrolyte secondary battery includes a roll-type electrode group including positive and negative electrode plates and a tape attached to the outermost circumferential surface of the electrode group. The tape has two adhesion regions including an adhesive layer and a non-adhesion region that is interposed between the two adhesion regions and is composed of a base material layer only. The non-adhesion region straddles the rolling-end edge of at least one of the positive or negative electrode active material layer on the roll inner side of the positive or negative electrode collector and the positive or negative electrode active material layer on the roll outer side of the positive or negative electrode collector in the positive or negative electrode plate when the electrode group is viewed from a roll center axis toward the outside of the roll.