Electrode Stack Rotation for Symmetrical Battery Assembly
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Solution Overview
Problem
Existing methods for manufacturing electrode assemblies face challenges in precisely aligning the electrodes and preventing bending, especially in stacked structures where symmetry is crucial.
Innovation Solution
A new stacking method involving primary, secondary, and tertiary stacks, where the primary stack is rotated 180° relative to the secondary stack, ensuring symmetrical alignment and preventing bending through precise error correction and stacking adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a stacked structure is used to manufacture electrode assembly, then productivity is improved, but manufacturing precision deteriorates due to alignment difficulties and bending defects
Solution Approach 1:
The electrode assembly manufacturing process is divided into multiple discrete stacking steps (first stacking step, second stacking step, third stacking step) with intermediate rotation operations. This segmentation allows each stacking operation to be performed with precise control, improving alignment precision while maintaining overall productivity through systematic progression.
Solution Approach 2:
The method performs preliminary stacking operations to create intermediate stack structures before final assembly. By pre-positioning electrode units in controlled intermediate configurations and then rotating 180°, the system establishes reference alignments that guide subsequent stacking steps, ensuring precise final positioning without compromising manufacturing speed.
2Device complexity
If conventional stacking method is used, then manufacturing process is simple, but electrode assembly symmetry deteriorates causing bending defects
Solution Approach 1:
The method intentionally introduces asymmetric operations (180° rotation between stacking steps) to achieve symmetric final results. By rotating the intermediate stack 180° before continuing stacking, the process compensates for cumulative alignment errors and ensures that electrode units are symmetrically positioned relative to the separator, preventing bending defects while adding controlled complexity to the manufacturing process.
Solution Approach 2:
The stacking process follows a periodic pattern: stack electrode units, rotate 180°, stack more units, rotate 180° again. This periodic rotation action resets alignment references at regular intervals, maintaining structural symmetry throughout the manufacturing process and preventing the accumulation of positioning errors that would lead to bending defects.
Data Source
AI summary
A method for manufacturing an electrode assembly comprises: a primary stack manufacturing step in which a first electrode and a second electrode are alternately stacked with a separator on a top surface of a table; a secondary stack manufacturing step in which the first electrode and the second electrode are alternately stacked with the separator on the primary stack so that the second electrode is stacked to be disposed at the lowermost end; a stack rotating step in which the primary stack and the secondary stack are rotated together at an angle of 180° to change positions of the primary stack and the secondary stack; and an electrode assembly manufacturing step in which the first electrode and the second electrode are alternately stacked with the separator on the primary stack so that the second electrode is stacked to be disposed at the lowermost end to manufacture a tertiary stack.