Battery Cell Electrode Assembly Without Adhesive Bonding Layers
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Solution Overview
Problem
Existing battery cells suffer from significant energy density loss due to the use of adhesive layers between electrode plates coated with active material on a single surface, leading to increased space occupation and reduced efficiency.
Innovation Solution
A battery cell design where the current collector of the first electrode plate is provided with active material layers on both sides, sharing a common collector with the second electrode plate group, reducing the need for adhesive layers and minimizing warping, while optimizing the use of active material and space within the packaging member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive layers are used to bond current collectors of electrode plates coated with active material on a single surface, then the electrode plates can be connected, but the space occupied by adhesive layers increases, leading to energy density loss
Solution Approach 1:
The patent merges the bonding function and current collection function into a single integrated current collector structure. The first current collector serves both as the current collector for the first electrode plate and as the bonding interface with the second electrode plate, eliminating the need for separate adhesive layers and reducing space occupation.
Solution Approach 2:
The first current collector is designed to perform multiple functions simultaneously: it acts as the current collector for the first electrode plate, provides structural support, and serves as the bonding interface with the second electrode plate. This multi-functionality eliminates the need for separate adhesive layers.
2Device complexity
If electrode plates coated with active material on a single surface are used, then the structure is simpler, but warping and curling occur, requiring thicker current collectors which leads to energy density loss
Solution Approach 1:
The patent applies different configurations of active material layers to different regions of the current collector. The first current collector has active material layers on both sides in the first region, while the second current collector has active material layers on both sides in the second region. This local differentiation maintains structural stability without requiring uniformly thick current collectors throughout.
Solution Approach 2:
The patent uses asymmetric current collector designs where the first current collector and second current collector have different configurations. The first current collector has active material layers on both sides in the first region, while the second current collector has active material layers on both sides in the second region, creating an asymmetric structure that balances warping forces.
3Stability of the object's composition
If active material layers are provided on both sides of the current collector, then warping is reduced, but the use of active material increases, potentially affecting energy density
Solution Approach 1:
The patent segments the current collector into different regions: the first current collector has active material layers on both sides in the first region, while the second current collector has active material layers on both sides in the second region. This segmentation allows active material to be placed only where needed for structural stability, rather than uniformly across all current collectors.
Solution Approach 2:
The patent applies active material layers on both sides of the current collector only in specific regions (first region and second region) rather than uniformly across the entire current collector. This local application maintains structural stability while minimizing the total quantity of active material used.
Data Source
AI summary
An electrode assembly includes a first electrode plate group and a second electrode plate group stacked along a first direction. Along a second direction, a length of the first electrode plate group is greater than a length of the second electrode plate group, the second direction is perpendicular to the first direction. The first electrode plate group includes a first electrode plate closest to the second electrode plate group, where the first electrode plate includes a current collector. The current collector includes a first region and a second region, both sides of the first region are provided with an active material layer, the second region is provided with the active material layer only on a side facing away from the second electrode plate group. The first region at least partially overlaps with the first electrode plate group.