Electrode Assembly Structure for Weld-Free Battery Connections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The welding process for connecting conductive substrates to metal substrates in secondary batteries can cause defects, such as pinholes, leading to reduced mechanical strength and electrical performance.
Innovation Solution
An electrode assembly design with insulating layers and conductive layers on opposite surfaces, where one end of each conductive layer extends beyond the insulating layer, forming uncoated portions in an air gap, and is connected to a conductive strip member for electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to connect conductive substrates to metal substrates, then electrical connection is achieved, but defects such as pinholes occur leading to reduced mechanical strength
Solution Approach 1:
The patent introduces a mixture substrate as an intermediary component between the insulating substrate and conductive substrate. This mixture substrate contains both insulating particles and conductive particles, allowing it to serve dual functions: providing mechanical support and insulation while enabling electrical connection through the conductive particles, thereby eliminating the need for welding and avoiding welding-induced pinholes
Solution Approach 2:
The invention uses a composite mixture substrate composed of insulating particles (such as alumina or silica) and conductive particles (such as metal particles or carbon particles). This composite structure allows the substrate to simultaneously provide mechanical strength, insulation, and electrical conductivity, resolving the contradiction between achieving electrical connection and maintaining mechanical strength
2Weight of moving object
If mixture substrate is used to reduce weight by replacing metal substrate, then weight is reduced, but electrical connection becomes difficult due to insulating properties
Solution Approach 1:
The mixture substrate is formulated as a composite material containing both insulating particles and conductive particles. The conductive particles (such as metal particles or carbon particles) dispersed within the insulating particle matrix provide electrical conductivity pathways, enabling effective electrical connection while the overall lightweight composition maintains the weight reduction benefit
Solution Approach 2:
The patent applies local quality by concentrating conductive particles in specific regions or interfaces where electrical connection is needed, while maintaining insulating properties in other regions. This spatial distribution of different properties allows the mixture substrate to achieve both weight reduction and reliable electrical connection
Data Source
AI summary
The present disclosure relates to an electrode assembly, a secondary battery, and a method for manufacturing the electrode assembly. The electrode assembly according to an embodiment of the present disclosure may include a first electrode, a second electrode, and a separator positioned between the first electrode or the second electrode. At least one of the first electrode and the second electrode may include an insulating layer, a first conductive layer, and a second conductive layer, where the first conductive layer and the second conductive layer are respectively positioned on opposite surfaces of the insulating layer, and one end of each of the first conductive layer and the second conductive layer may extend beyond the insulating layer in a longitudinal direction.