Reinforced Electrode Plate Bending for Thin Battery Cell Alignment
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Solution Overview
Problem
Thin electrode plates in battery cells are prone to misalignment during bending, affecting processing yield and use performance, potentially leading to safety incidents.
Innovation Solution
Incorporating a reinforcing structure, such as a protrusion or indentation, near the bending segment of the electrode plate to enhance the strength of the laminated segment, allowing precise bending and reducing misalignment and wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode plate is designed to be thin to increase energy density, then the energy density is improved, but the electrode plate becomes prone to misalignment during bending
Solution Approach 1:
The patent applies local quality by providing a reinforcing structure only in the bending segment of the electrode plate, while the laminated segment remains thin. This localized reinforcement allows the thin electrode plate to maintain high energy density while preventing misalignment during bending through the strengthened bending segment.
Solution Approach 2:
The electrode plate is divided into distinct segments: a laminated segment for active material and a bending segment with reinforcing structure. This segmentation allows different parts of the electrode plate to have different thicknesses and properties, enabling the thin laminated segment to achieve high energy density while the reinforced bending segment ensures precise bending alignment.
2Quantity of substance
If the electrode plate is designed to be thin to increase energy density, then the energy density is improved, but the processing yield deteriorates due to misalignment
Solution Approach 1:
The reinforcing structure is locally applied only in the bending segment, maintaining the thin profile of the laminated segment for high energy density while providing targeted reinforcement to prevent misalignment during bending, thereby improving processing yield without sacrificing energy density.
3Manufacturing precision
If a reinforcing structure is added to prevent misalignment, then the bending alignment precision is improved, but the device complexity increases
Solution Approach 1:
The reinforcing structure is applied locally only in the bending segment rather than throughout the entire electrode plate. This localized approach improves bending alignment precision while minimizing the increase in overall structural complexity and maintaining the thin profile of the active laminated segment.
4Manufacturing precision
If the protrusion height ratio is increased to enhance reinforcing strength, then the bending alignment precision is improved, but the space utilization rate deteriorates
Solution Approach 1:
The patent optimizes the protrusion height ratio as a critical parameter, setting it within a specific range to achieve the desired balance. By carefully controlling this parameter, the reinforcing structure provides sufficient strength to prevent misalignment while minimizing the space occupied, thereby maintaining high space utilization rate in the battery cell.
Data Source
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AI summary
An electrode plate (30), an electrode assembly (22), a battery cell (20), a battery (10), an electric device, and a method for manufacturing electrode assembly (22) are provided. The electrode plate (30) includes: a laminated segment (31) and a bending segment (32), the bending segment (32) is connected to the laminated segment (31), and the bending segment (32) is configured for bending, where a region of the laminated segment (31) close to the bending segment (32) is provided with a reinforcing structure (33).