Electrode Assembly Layout for Burr-Free Battery Plate Connection
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Solution Overview
Problem
Existing electrode assemblies in secondary batteries face challenges in efficiently connecting electrode plates without causing burrs or active material detachment, which can affect the quality and safety of the battery.
Innovation Solution
The electrode assembly design includes uncoated portions on the electrode plates with specific bending lines and connecting members that connect the plates, eliminating the need for notching and preventing burrs, while ensuring proper alignment and connection of positive and negative electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode plates are connected using conventional notching methods, then connection is achieved, but burrs and active material detachment occur affecting quality and safety
Solution Approach 1:
The electrode plate is divided into a coated portion with active material and an uncoated portion without active material. The uncoated portion serves as a dedicated connection region that is free from active material, preventing detachment issues while allowing secure electrical connection through the connecting member.
Solution Approach 2:
The active material is extracted or removed from the connection region, creating an uncoated portion on the electrode plate. This separation ensures that the connection area is free from active material that could detach, while the coated portions maintain their electroactive functionality.
2Manufacturing precision
If uncoated portions with bending lines are used for connection, then connection quality improves and burrs are prevented, but manufacturing complexity increases
Solution Approach 1:
Bending lines are pre-formed on the uncoated portion of the electrode plate during manufacturing. These bending lines serve as guides that facilitate precise alignment and folding of the electrode plate edges, ensuring accurate connection positioning without requiring complex adjustment mechanisms during assembly.
3Reliability
If connecting members are used to connect electrode plates, then electrical connection is achieved, but energy density may be reduced due to additional components
Solution Approach 1:
The uncoated portion of the electrode plate itself serves as the connection interface, eliminating the need for separate connection structures on the electrode. The connecting member directly attaches to the uncoated portion, which is already part of the electrode plate, thereby minimizing additional material and maintaining higher energy density.
Data Source
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AI summary
An electrode assembly includes positive and negative electrode plates, each electrode plate including a respective positive or negative electrode mixture portion on which a respective positive or negative electrode active material is applied to an electrode substrate and a first uncoated portion on which an electrode active material is not applied to the respective positive or negative electrode substrate, and a separator between each of the positive electrode plates and each of the negative electrode plates, the positive and negative electrode mixtures each have two portions, separated by uncoated sections, the lengths of the bent uncoated portions match the lengths of their respective electrode substrates, and bent uncoated portions match the lengths of their respective electrode substrates.