Electrode Assembly Winding Layout for Opposed Uncoated Tabs
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Solution Overview
Problem
Existing secondary battery manufacturing processes face challenges in efficiently winding electrode plates with uncoated portions facing different directions and achieving balanced active material coating, leading to potential misalignment and performance issues in the battery assembly.
Innovation Solution
A secondary battery manufacturing device is designed with two unwinders for negative and positive electrode plate foils, and two winding devices that wind electrode assemblies in opposite directions, ensuring the uncoated portions of the negative and positive electrodes face opposite directions, and the active material is coated in a stripe pattern for balanced distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single winding device is used to wind electrode assemblies, then the device complexity is reduced, but the manufacturing precision of uncoated portion alignment deteriorates
Solution Approach 1:
The patent divides the winding operation into two separate winding devices (first winding device and second winding device), each responsible for winding electrode assemblies with specific uncoated portion orientations. This segmentation allows precise control over the alignment of uncoated portions while maintaining manageable device complexity through functional specialization.
Solution Approach 2:
The patent employs winding devices that rotate in opposite directions (first winding device rotates clockwise, second winding device rotates counterclockwise) to achieve different uncoated portion orientations. This inversion approach enables the production of electrode assemblies with alternating positive and negative terminal orientations, solving the alignment precision problem through directional differentiation.
2Ease of manufacture
If electrode plate foils are wound with uncoated portions facing the same direction, then the winding process is simplified, but the battery performance deteriorates due to unbalanced active material distribution
Solution Approach 1:
The patent intentionally creates asymmetry in the winding process by producing electrode assemblies with alternating orientations (positive terminal up/down, negative terminal down/up). This asymmetric arrangement ensures balanced distribution of active materials and proper alignment of uncoated portions with current collectors, thereby improving battery performance while maintaining manufacturing simplicity through automated alternating winding.
Solution Approach 2:
The patent implements periodic action by alternating the winding direction between the first and second winding devices in a regular sequence. This periodic alternation ensures that electrode assemblies are produced with consistent alternating patterns of uncoated portion orientations, achieving both manufacturing ease and performance reliability through rhythmic, predictable operation.
3Ease of manufacture
If active material is coated on both surfaces of electrode plate foil in unbalanced manner, then the coating process is simplified, but the manufacturing precision of active material distribution deteriorates
Solution Approach 1:
The patent applies local quality by allowing unbalanced coating on individual electrode plate foils (different coating amounts on positive and negative surfaces) while compensating through the alternating winding arrangement. This approach simplifies the coating process for each individual foil while the overall system achieves balanced active material distribution through the complementary arrangement of positively and negatively coated foils in alternating sequence.
Data Source
AI summary
A secondary battery manufacturing device according to an embodiment of the present disclosure may include an unwinder configured to supply a wound electrode plate foil and a plurality of slitters configured to cut the electrode plate foil supplied from the unwinder at predetermined intervals to form a plurality of electrode plate foils. The device may further include a plurality of rewinders configured to wind the electrode plate foils discharged from the slitters in one direction, and a first winding device and a second winding device configured to wind the electrode plate foils discharged from the separators and separators and discharge the wound electrode assemblies that include the electrode plate foils and separators. With the device, a process of unwinding and rewinding a previously wound winding material to adjust a direction of an uncoated portion or electrode plate surface is not necessary, and the manufacturing time for a secondary battery may be reduced.