Wound Electrode Assembly Alignment for Bent-Region Deformation
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Solution Overview
Problem
The cycling process in secondary batteries leads to deformation of the electrode assembly due to the repeated expansion and contraction of the electrodes, which is structurally vulnerable, particularly at the leading edge bent region, causing stress concentration and potential deformation.
Innovation Solution
The negative and positive electrode active material layers are aligned based on the positions of the trailing edges of the leading edge bent regions, with specific alignment and coating positions to fill the voids in the core part of the electrode assembly, preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If electrodes are repeatedly charged and discharged, then battery capacity is utilized, but electrode thickness changes cause structural deformation and stress concentration
Solution Approach 1:
The patent applies preliminary action by pre-positioning the active material layers to extend into the leading edge bent region before cycling begins. This advance preparation ensures that when charging and discharging cause electrode thickness changes, the active material layers are already in place to fill voids and maintain structural integrity, preventing deformation and stress concentration during subsequent cycling operations.
2Stability of the object's composition
If active material layers are positioned to fill voids in bent regions, then structural integrity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by making the active material layers extend specifically into the leading edge bent region where voids form during winding, rather than uniformly across the entire electrode. This localized extension targets the specific area needing structural support while maintaining standard manufacturing tolerances for the rest of the electrode assembly, thus improving structural integrity without excessively increasing overall manufacturing precision requirements.
Data Source
AI summary
An electrode assembly includes a negative electrode plate including a negative electrode current collector and a negative electrode active material layer on a part of each of opposite surfaces of the negative electrode current collector, a positive electrode plate including a positive electrode current collector and a positive electrode active material layer on a part of each of opposite surfaces of the positive electrode current collector, and a separator between the negative electrode plate and the positive electrode plate, wherein the negative electrode plate, the positive electrode plate, and the separator are wound while defining a plurality of bent regions, and the negative electrode active material layer and the positive electrode active material layer are aligned based on positions of trailing edges of leading edge bent regions of the plurality of bent regions of the negative electrode plate and the positive electrode plate.