Electrode Assembly Structure for Suppressing Jelly-Roll Cell Expansion
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Solution Overview
Problem
The irregular expansion of the single-surface-coated region in jelly-roll battery cells leads to deformation and reduced energy density due to the uneven expansion of the negative electrode during charging and discharging cycles.
Innovation Solution
An electrode assembly design that includes a first and second uncoated region connected by a connecting piece, enhancing the internal rigidity of the battery cell and preventing irregular expansion, while maintaining the single-surface-coated region intact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single-surface-coated region is used in the electrode plate, then the manufacturing complexity is reduced and energy density is improved, but the electrode plate deforms irregularly during charging and discharging cycles
Solution Approach 1:
The single-surface-coated region is divided into two separate uncoated regions (first uncoated region and second uncoated region) that are disposed oppositely. These two regions are then connected by a connecting piece to form a unified support structure, segmenting the expansion stress and preventing irregular deformation while maintaining the energy density benefits of the single-surface-coated design
Solution Approach 2:
A connecting piece is introduced as an intermediary element between the first uncoated region and the second uncoated region. This connecting piece serves as a mediator that connects the two oppositely disposed uncoated regions, providing structural support and preventing irregular expansion during battery cycles while allowing the single-surface-coated region to maintain its high energy density configuration
2Stability of the object's composition
If connecting pieces are added to connect uncoated regions, then structural stability is improved and deformation is prevented, but the device complexity increases
Solution Approach 1:
The connecting piece is designed as a thin, flexible component that can be easily integrated into the electrode assembly. This thin-film approach provides the necessary structural support to connect the two uncoated regions while minimizing the increase in assembly complexity and maintaining a compact battery structure
3Quantity of substance
If the single-surface-coated region is maintained without connecting pieces, then the energy density remains high and manufacturing is simple, but irregular expansion occurs during battery cycles
Solution Approach 1:
The single-surface-coated region is segmented into two oppositely disposed uncoated regions that are connected by a connecting piece. This segmentation allows the structure to accommodate expansion stresses from the coated regions while maintaining the high energy density configuration, thereby improving cycle stability without sacrificing energy density
Solution Approach 2:
The connecting piece is pre-installed to connect the two uncoated regions before the battery undergoes charging and discharging cycles. This preliminary structural reinforcement prevents irregular expansion from occurring during cycles, ensuring reliable performance while maintaining the energy-dense single-surface-coated configuration
Data Source
AI summary
An electrode assembly, including a first electrode plate, a second electrode plate, and a separator. The separator is disposed between the first electrode plate and the second electrode plate. The electrode assembly further includes a first tab disposed on the first electrode plate, and a second tab and a third tab that are disposed on the second electrode plate. Projections of the first tab, the second tab, and the third tab on the first electrode plate do not overlap. The electrode assembly is provided with a multi-tab structure to achieve purposes of enhancing a current-carrying capacity of the battery and reducing a temperature rise.