Electrode Plate Spreading Device for Secondary Battery Curling
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Solution Overview
Problem
The curling of half cathode electrode plates during the press process in stack-type rechargeable batteries leads to misalignment and manufacturing inefficiencies, affecting the quality and safety of the batteries.
Innovation Solution
An electrode plate spreading device with a magazine, bottom jig, and top jig system that supports and presses the curled electrode plates to flatten them, utilizing a pressing member to maintain the pressed state, allowing for improved alignment and reduced curling issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coated region is stretched more than the uncoated region during the press process, then the active material coated portion is formed, but the electrode plate curls toward the uncoated region
Solution Approach 1:
The patent applies preliminary anti-action by pre-flattening the electrode plate before the press process. A flattening device is used to apply pressure to the electrode plate in advance, counteracting the curling force that will occur during subsequent pressing. This preliminary counter-action prevents the electrode plate from curling toward the uncoated region during the coating formation process.
Solution Approach 2:
The patent implements preliminary action by performing the flattening operation before the press process. The electrode plate is pre-pressed to a predetermined thickness using a flattening device, ensuring it remains flat during the subsequent press process where the coated region is formed. This sequence of operations ensures the electrode plate maintains its flatness throughout the manufacturing process.
2Shape
If the electrode plate is flattened using conventional methods, then the curling is reduced, but the flattening effect is insufficient for stack-type batteries
Solution Approach 1:
The patent applies local quality by differentiating the pressing force applied to different regions of the electrode plate. The flattening device presses the electrode plate to a predetermined thickness, applying localized pressure where needed to achieve uniform flatness across the entire electrode plate surface, ensuring sufficient flattening effectiveness for stack-type batteries.
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 device effectively spreads and aligns electrode plates, enhancing the manufacturing process by reducing misalignment and improving battery quality and safety.
Implementation Method 1
a bottom jig provided downwardly toward the inside of the magazine and supporting the electrode plates with a curvature supporting surface
Implementation Method 2
a top jig provided above the magazine and having a curvature pressing surface to press the electrode plates
Implementation Method 3
a pressing member that presses the top jig and maintains the pressed state
Data Source
AI summary
An electrode plate spreading device of a rechargeable battery according to an embodiment of the present disclosure includes: a magazine stacking electrode plates in which one surface of a base substrate is an uncoated region and the other surface is a coated region, and are punched out and curled toward the base substrate; a bottom jig provided downwardly inside the magazine and supporting the electrode plates with a curvature supporting surface; a top jig provided above the magazine and having a curvature pressing surface to press the electrode plates; and a pressing member that presses the top jig and maintains the pressed state.