Electrode Tab Flattening Structure to Prevent Jamming
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Solution Overview
Problem
Thinner current collectors in batteries are prone to folding, edge sagging, or bending, which complicates the tab formation process and can lead to jamming issues during flattening.
Innovation Solution
A tab flattening device comprising a roller, a cover, and a flattening portion with a feed-in guide surface and a tab guide surface, where the flattening portion is located upstream of the contact region to apply a flattening force to the tab before it enters the contact region, preventing jamming and ensuring smooth flattening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the current collector is made thinner to increase energy density, then the energy density is improved, but the tab becomes prone to folding, edge sagging, or bending
Solution Approach 1:
The flattening portion is positioned upstream of the contact region to perform preliminary flattening action on the tab before it enters the contact region. This preliminary action prevents folding, edge sagging, and bending by applying flattening force in advance, resolving the stability issue caused by using thinner current collectors for higher energy density.
2Manufacturing precision
If the flattening portion is positioned in the contact region to flatten the tab, then the flattening effect is improved, but the tab is prone to get jammed between the flattening portion and the roller
Solution Approach 1:
The flattening portion is positioned upstream of the contact region rather than within it, performing the flattening action before the tab enters the contact region. This spatial separation prevents the tab from being jammed between the flattening portion and the roller while still achieving effective flattening, thus resolving the contradiction between flattening precision and jamming prevention.
3Manufacturing precision
If the flattening force is applied after the tab enters the contact region, then the tab is flattened, but the folded part of the tab is prone to be jammed
Solution Approach 1:
The flattening portion applies flattening force upstream of the contact region, before the tab placement part enters the contact region. This timing and position separation ensures the tab is flattened in advance without causing jamming, effectively resolving the contradiction between achieving tab flatness and preventing jamming.
Data Source
AI summary
This application relates to a tab flattening device. The tab flattening device includes: a roller configured to convey an electrode plate, a cover, and a flattening portion. The surface of the roller is in contact with the electrode plate in a contact region. The cover surrounds the contact region peripherally and includes a feed-in guide surface oriented toward the contact region. The flattening portion is disposed protrusively on the feed-in guide surface, and located opposite to a tab of the electrode plate. A tab guide surface is formed on the flattening portion. Along a feed-in direction of the electrode plate, the flattening portion is at least partially located upstream of the contact region.