Battery Cell Tape Overlap Layout for Dense Cell Stacking
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Solution Overview
Problem
The existing method of winding tape around the outer perimeter of a battery cell, forming overlapping portions, leads to increased volume in the stacking direction, thereby reducing volume efficiency when battery cells are stacked.
Innovation Solution
The battery cell design involves stacking laminated structures of cathodes, anodes, and separators, with tape wound around the outer perimeter. The overlapping portions of the tape are strategically placed on a surface other than the stacking face, optimizing space usage and reducing volume inefficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tape is wound one round around the outer perimeter of the electrode body with overlapping portions disposed on the stacking face, then the electrode body is securely fixed, but the volume in the stacking direction increases and volume efficiency decreases
Solution Approach 1:
The patent applies dimensionality change by moving the tape overlapping portions from the stacking face (one dimension) to the side surface of the electrode body (another dimension). This spatial relocation eliminates the volume occupation on the stacking face while maintaining the fixing function through the tape's continuous wrapping around the electrode body's outer perimeter.
2Quantity of substance
If multiple battery cells are stacked together, then the overall battery capacity increases, but the overlapping portions on the stacking face create wasted space that reduces the stacking density
Solution Approach 1:
The patent extracts the overlapping portions from the stacking face and relocates them to the side surface of the electrode body. This extraction eliminates the wasted space on the stacking face, allowing battery cells to be stacked more densely while maintaining the same quantity of active materials and thus the same battery capacity.
3Stability of the object's composition
If the tape is applied with overlapping portions on the stacking face, then the electrode body structure is stabilized, but the space utilization in the stacking direction is reduced
Solution Approach 1:
The patent resolves this contradiction by transferring the overlapping portions to the side surface dimension, thereby preserving the structural stability provided by the tape's continuous wrapping while optimizing the space utilization on the stacking face for maximum battery cell density.
Data Source
AI summary
A battery cell includes an electrode body in which a plurality of laminated structures having a cathode, an anode, and a separator interposed between the cathode and the anode are further laminated, and a tape wound around the outer periphery of the electrode body over one circumference, wherein the tape has an overlapping portion in which one side and the other end side in an outer peripheral direction overlap each other, and a direction in which a plurality of laminated structures are laminated in the electrode body is defined as a lamination direction, and in a case where an end surface in a lamination direction in the electrode body is defined as a lamination surface, the overlapping portion is disposed on a surface other than the lamination surface in the electrode body.