Rechargeable Battery Cell Stack Thickness Correction for Stable Output
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Solution Overview
Problem
Rechargeable batteries face issues with non-uniform thickness in their electrode assemblies due to manufacturing processes, leading to decreased joining forces between electrodes and separators, which affects output characteristics and stability.
Innovation Solution
The introduction of a correction sheet on the thinner parts of the electrode assembly, combined with a thermal press device to apply uniform pressure, ensures that the entire cell stack achieves a uniform thickness, thereby enhancing the joining forces between electrodes and separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a non-uniform composite material layer is manufactured on the electrode substrate, then the manufacturing process is simple and fast, but the electrode assembly thickness becomes non-uniform and joining forces decrease
Solution Approach 1:
The correction sheet is attached to the thinner region of the electrode assembly before the final sealing process. This preliminary action compensates for the thickness non-uniformity in advance, allowing the simple coating process to be maintained while achieving uniform final thickness through the added correction layer.
2Quantity of substance
If the composite material layer thickness is insufficient in certain regions, then material usage is reduced and cost is lowered, but joining forces between electrodes and separators decrease
Solution Approach 1:
The correction sheet acts as an intermediary layer placed in regions where the composite material layer is insufficient. This intermediary compensates for the inadequate thickness without requiring additional expensive active materials, thereby maintaining joining forces while controlling material consumption.
3Device complexity
If the electrode assembly has non-uniform thickness, then the manufacturing process remains simple, but output characteristics and output stability degrade
Solution Approach 1:
The invention changes the thickness parameter of the electrode assembly by adding a correction sheet with specific thickness to the thinner regions. This parameter adjustment improves output stability without complicating the overall manufacturing process, as the correction sheet attachment is integrated into the existing assembly workflow.
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 solution effectively improves the uniformity of the electrode assembly thickness and increases the joining forces between electrodes and separators, resulting in enhanced output characteristics and stability of the rechargeable battery.
Implementation Method 1
Each of the pair of correction sheets may be configured as a polymer film having an adhesive layer
Implementation Method 2
The cell stack may have a uniform thickness by being pressed by a thermal press device after the correction sheet is attached to the second part
Implementation Method 3
The pair of first fixing parts is positioned over a front surface, a lateral surface and a rear surface of the cell stack, the pair of first fixing parts having a portion that overlaps the correction sheet
Data Source
AI summary
A rechargeable battery includes an electrode assembly and a casing configured to accommodate and seal the electrode assembly, wherein the electrode assembly includes a cell stack including a plurality of first electrodes and a plurality of second electrodes alternately stacked one by one with a separator interposed therebetween, the cell stack including a first part having a first thickness, and a second part having a second thickness smaller than the first thickness, a correction sheet positioned on the second part and configured to uniformize a thickness of the cell stack, and a pair of first fixing parts positioned over front, lateral, and rear surfaces of the cell stack and having a portion that overlaps the correction sheet.