Electrode Plate Insulation Layout for Tab and Burr Isolation
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Solution Overview
Problem
Existing battery technologies face challenges in ensuring safety, particularly due to the risk of short circuits caused by electrode tab contacts and burrs piercing separators during assembly and use.
Innovation Solution
The electrode assembly incorporates insulation portions on electrode plates to prevent tab contacts and burrs, featuring coverage and connection zones to enhance safety by reducing the risk of short circuits and improving cycling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrode plates are stacked closely to increase energy density, then productivity and space utilization are improved, but the risk of short circuits increases due to potential tab contact and burrs piercing separators
Solution Approach 1:
An insulation portion is introduced as an intermediary element between the electrode tab and the separator. This insulation portion wraps around the tab and extends to cover the separator, creating a physical barrier that prevents direct contact between conductive elements. The insulation portion acts as a mediator that maintains the necessary electrical isolation while allowing the electrode plates to be stacked closely for high energy density.
Solution Approach 2:
The insulation portion is pre-installed on the electrode tab before assembly, and it is designed to extend in advance to cover the separator position. This preliminary action ensures that the protective barrier is already in place before the electrode plates are stacked, preventing potential short circuits from tab contact or burrs piercing the separator during assembly and operation.
2Reliability
If insulation portions are added to prevent tab contact, then safety is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The insulation portion is designed as a thin film or flexible insulating material that wraps around the electrode tab. This thin film structure provides effective electrical insulation without adding significant bulk or complexity to the overall battery structure. The flexible nature of the insulation portion allows it to conform to the tab shape and be easily integrated into the existing electrode assembly process.
Solution Approach 2:
The insulation portion is combined with the electrode tab structure itself, forming an integrated assembly where the insulation is an inherent part of the tab design rather than a separate component. This merging reduces the number of discrete parts and simplifies the assembly process, as the insulated tab can be handled and stacked as a single unit with the electrode plates.
3Reliability
If insulation portions extend to cover separators, then protection against burrs is improved, but the amount of insulation material and manufacturing steps increase
Solution Approach 1:
The insulation portion is pre-formed with an extended section that will cover the separator position before assembly occurs. This preliminary preparation allows the insulation to be installed in a single step during electrode assembly, rather than requiring separate operations to apply insulation to the tab and then separately ensure separator coverage. The extended portion is already in place to protect against burrs piercing the separator.
Solution Approach 2:
The insulation portion uses a thin film material that can be easily formed and applied. This thin film structure minimizes the amount of material required while still providing effective coverage over the separator area. The flexibility of the thin film allows it to be conformally applied to the tab and extended to cover the separator position without requiring complex shaping or multiple layers.
Data Source
AI summary
An electrode assembly includes a first electrode plate and a second electrode plate. The first electrode plate includes a first body portion and a tab. The first body portion has a first end portion in a first direction. The tab is coupled to the first end portion. The second electrode plate includes a second body portion and an insulation portion coupled to the second body portion. The first body portion and the second body portion are stacked in a stacking direction perpendicular to the first direction. The second body portion has a second end portion close to the tab in the first direction. The insulation portion covers at least part of the second end portion so as to separate the tab from the second end portion when the tab is bent.