Electrode Sheet Tab Layout for Reliable Battery Cell Conduction
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Solution Overview
Problem
Conventional lithium-ion batteries with metal foils as current collectors lack sufficient safety performance and efficient electron conduction between tabs and tab leads, especially when subjected to damage such as impact or puncture, due to non-conductive gaps between metal layers in composite current collectors.
Innovation Solution
The design of an electrode sheet with tabs of varying widths or lengths, arranged in arithmetic progression, and a composite current collector structure including polymer and metal layers, ensures each tab is electrically connected to the tab lead, enhancing safety and reducing weight by optimizing electron conduction paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tabs of varying widths or lengths are designed, then electrical connection between each tab and tab lead is ensured, but device complexity increases
Solution Approach 1:
The patent applies local quality by designing tabs with varying widths or lengths at different positions according to specific arithmetic progressions. This localized variation in tab dimensions ensures optimal electrical connection and current distribution for each tab while maintaining a systematic and manufacturable overall structure, resolving the contradiction by making the complexity systematic rather than arbitrary
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the safety performance of lithium-ion batteries, reduces weight, and ensures effective electrical conduction between tabs and external devices, while maintaining high energy density and mechanical strength.
Implementation Method 1
a first metal layer located on a surface of the first polymer layer... ensures each tab is electrically connected to the tab lead... enhancing safety and reducing weight by optimizing electron conduction paths
Data Source
AI summary
A battery cell includes an electrode sheet. The electrode sheet includes an electrode sheet body and a plurality of tabs connected to the electrode sheet body. The width of each of the plurality of tabs is different from one another; or the length of each of the plurality of tabs is different from one another. The electrode sheet and the battery cell having the electrode sheet ensures that each of the tabs in the electrode sheet can electrically conduct well with the tab lead. Thus, the battery cell has the advantage of good electrical conductivity.