Jelly-Roll Battery Cell Layout for Higher Energy Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing jelly-roll battery cells have low energy density and space utilization due to the conventional design with multiple separator layers, which limits their performance in high-energy density applications.
Innovation Solution
A redesigned jelly-roll battery cell structure with only two layers of separators in the central region, optimizing the positional relationship between the separator and electrode plates to reduce thickness and enhance space utilization, while minimizing overlap with electrode tabs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separator layers are used in conventional jelly-roll battery cell design, then safety and structural stability are improved, but thickness increases and space utilization decreases
Solution Approach 1:
The patent extracts and removes redundant separator layers from the conventional multi-layer structure, reducing from multiple separator layers to only two separator layers (first and second separators) positioned strategically to maintain safety while minimizing thickness
Solution Approach 2:
The patent repositions the separator layers in the thickness direction to optimize spatial arrangement, ensuring that the first and second separators are positioned at different locations along the winding direction to maintain structural stability with minimal thickness
2Stability of the object's composition
If multiple separator layers are used in conventional jelly-roll battery cell design, then structural stability is improved, but energy density decreases due to reduced active material space
Solution Approach 1:
The patent extracts unnecessary separator layers, retaining only the essential first and second separators, thereby freeing up space for active material while preserving the structural stability needed for safe operation
Solution Approach 2:
The patent applies separators locally at critical positions rather than uniformly throughout the structure, placing the first and second separators at specific locations to provide structural stability only where needed, maximizing space for active material elsewhere
3Ease of manufacture
If separator layers overlap with electrode tabs in the thickness direction, then manufacturing is simplified, but space utilization decreases and thickness increases
Solution Approach 1:
The patent positions the first and second separators at different locations along the winding direction, creating a staggered arrangement that prevents overlap with electrode tabs in the thickness direction, thereby reducing overall cell thickness while maintaining manufacturing feasibility
Data Source
AI summary
A jelly-roll battery cell includes a first electrode plate, a second electrode plate, and a separator, and includes a central region enclosed by the first electrode plate, the second electrode plate, and the separator, and has a thickness direction. The first electrode plate includes: a first current collector, where the first current collector includes a first surface and a second surface opposite to the first surface, and the first surface is closer to the central region than the second surface; a first section; and a second section, where a first tab is disposed on the first surface in the second section. The second electrode plate includes a second tab whose first side is on the second electrode plate. The first end, the first tab, and the second tab do not overlap in a thickness direction.