Segmented Electrode Assembly With Variable Coating Density

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Solution Overview

Problem

Existing battery technologies face challenges in differentiating the performance of electrode assemblies, leading to poor performance and safety issues due to uniform coating density and material distribution, which affects energy density and fracture toughness.

Innovation Solution

The electrode assembly is segmented into distinct segments with varying active substance layers and coating densities, allowing for differential treatment and configuration to meet specific performance requirements, enhancing energy density and safety by adjusting the coating density and material distribution along the winding direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the electrode plate uses uniform coating density throughout, then the manufacturing process is simple, but the energy density is insufficient and fracture toughness is poor

Engineering Contradiction:

Improvecoating density uniformityVSAvoidenergy density

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The electrode plate is designed with different coating densities in different regions: the first coating region has a first coating density, while the second coating region has a second coating density that is higher than the first. This local differentiation allows the battery to achieve higher overall energy density while maintaining manufacturing feasibility through region-specific optimization rather than uniform design.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If the electrode plate uses uniform coating density throughout, then the manufacturing process is simple, but the fracture toughness is poor

Engineering Contradiction:

Improvecoating density uniformityVSAvoidfracture toughness

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

3Reliability

If the electrode assembly is segmented with different coating densities, then the energy density and fracture toughness are improved, but the manufacturing complexity increases

Engineering Contradiction:

Improveenergy densityVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electrode plate is divided into multiple coating regions along the winding direction, with each region having different coating densities. The first coating region has a first coating density, while the second coating region has a second coating density that is higher than the first. This segmentation allows different portions of the electrode to be optimized for different performance requirements, achieving higher energy density and fracture toughness through differentiated design.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240006649A1Electrode assembly, battery cell, battery, electrical equipment, winding equipment, and method

Publication Date: 2024.01.04 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

The present disclosure relates to an electrode assembly, a battery cell, a battery, an electrical equipment, a winding equipment, and a method, which belongs to the battery technology field. The electrode assembly may include a first electrode plate and a second electrode plate with opposite polarity, wherein the first electrode plate and the second electrode plate may be stacked and wound along the winding direction to form the electrode assembly, wherein the first electrode plate may include a first segment and a second segment, wherein the first segment may be provided with a first active substance layer, and the second segment may be provided with a second active substance layer, and the first segment may be located upstream of the second segment along the winding direction from inside to outside.