Battery Cell Electrode Groove Adhesive Layout for Lithium Plating
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Solution Overview
Problem
In battery production, the uneven thinning of active material layers around tab grooves leads to abnormal thickness, increasing the risk of lithium plating, which affects battery performance and energy density.
Innovation Solution
A battery cell design where the adhesive layer's length on one thinned region is less than on the adjacent region, ensuring complete coverage of the groove while minimizing coverage on the first thinned region, thereby reducing lithium plating risk and enhancing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same length of adhesive layer is applied on both sides of the groove, then the groove is completely covered, but the coverage on the first thinned region is excessive, increasing lithium plating risk
Solution Approach 1:
The adhesive layer is designed with different lengths on different sides of the groove. The first adhesive layer has a first length on the first side and a second length on the second side, where the lengths are different. This local differentiation allows the adhesive to provide appropriate coverage on each side according to the local thickness requirements, preventing lithium plating on the thinner first thinned region while maintaining adequate coverage on the second thinned region.
Solution Approach 2:
The adhesive layer configuration breaks the symmetry by applying different lengths of adhesive on opposite sides of the groove. The first length and second length are intentionally made asymmetric to match the asymmetric thinning pattern of the active material layer, with the thinner side receiving less adhesive coverage and the thicker side receiving more coverage.
2Quantity of substance
If the adhesive layer coverage on the first thinned region is reduced, then energy density increases, but the groove coverage may be insufficient
Solution Approach 1:
The adhesive layer is designed with different lengths on different sides of the groove. The first adhesive layer has a first length on the first side and a second length on the second side, where the lengths are different. This local differentiation allows the adhesive to provide appropriate coverage on each side according to the local thickness requirements, preventing lithium plating on the thinner first thinned region while maintaining adequate coverage on the second thinned region.
Solution Approach 2:
The adhesive layer configuration breaks the symmetry by applying different lengths of adhesive on opposite sides of the groove. The first length and second length are intentionally made asymmetric to match the asymmetric thinning pattern of the active material layer, with the thinner side receiving less adhesive coverage and the thicker side receiving more coverage.
3Reliability
If the adhesive layer is optimized for lithium plating prevention, then battery performance improves, but manufacturing complexity increases
Solution Approach 1:
The adhesive layer is designed with different lengths on different sides of the groove. The first adhesive layer has a first length on the first side and a second length on the second side, where the lengths are different. This local differentiation allows the adhesive to provide appropriate coverage on each side according to the local thickness requirements, preventing lithium plating on the thinner first thinned region while maintaining adequate coverage on the second thinned region.
Solution Approach 2:
The adhesive layer configuration breaks the symmetry by applying different lengths of adhesive on opposite sides of the groove. The first length and second length are intentionally made asymmetric to match the asymmetric thinning pattern of the active material layer, with the thinner side receiving less adhesive coverage and the thicker side receiving more coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces lithium plating occurrences and increases battery energy density by optimizing adhesive layer distribution based on thinned region thickness differences.
Implementation Method 1
A first adhesive layer is bonded to the first thinned region and extends from the first thinned region to the second thinned region. A part of the first adhesive layer covers the first groove.
Data Source
AI summary
A battery cell includes a first electrode plate which includes a first current collector and a first active material layer. The first current collector includes a first surface. The first active material layer includes a first part and a second part. A first groove is formed between the first part and the second part to expose the first surface. Along a first direction, a first thinned region is disposed at a position adjacent to the first groove in the first part, and a second thinned region is disposed at a position adjacent to the first groove in the second part. A thickness of the second thinned region is greater than a thickness of the first thinned region. The battery cell further includes a first adhesive layer which extends from the first thinned region to the second thinned region. A part of the first adhesive layer covers the first groove.