Stacked Battery Cell Current Collector Layout for Lower Resistance
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Solution Overview
Problem
Current lithium-ion secondary power batteries, especially those with a large length-to-width ratio, suffer from increased internal resistance, uneven current density, and temperature distribution due to overlong current transmission paths, primarily caused by tabs being arranged on one or two short sides.
Innovation Solution
The design alternately stacks positive and negative electrode sheets with current collectors on long sides and tabs on short sides, connected by margin base materials or connecting substrates, increasing current conduction paths and reducing electron conduction distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If tabs are arranged on one or two short sides of the power battery, then the battery structure is simple, but the current transmission path becomes overlong, causing internal resistance increase and uneven current density distribution
Solution Approach 1:
The patent transitions from traditional tab arrangements on short sides to placing current collectors on long sides of electrode sheets. This dimensional change in tab positioning creates shorter current transmission paths and enables more uniform current density distribution across the electrode surface, effectively reducing internal resistance while maintaining structural simplicity
2Device complexity
If tabs are arranged on one or two short sides of the power battery, then the battery structure is simple, but uneven temperature distribution occurs due to overlong current transmission path
Solution Approach 1:
By repositioning current collectors from short sides to long sides of electrode sheets, the patent creates a more distributed current collection geometry. This dimensional rearrangement shortens current paths and promotes more uniform heat generation and dissipation throughout the battery, achieving better temperature distribution without increasing structural complexity
3Reliability
If current collectors are placed on long sides of electrode sheets, then current conduction paths are increased and internal resistance is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent divides the battery into multiple electrode sheets with current collectors positioned on long sides. This segmentation approach allows each individual electrode sheet to have optimized current collection geometry, which when assembled creates a battery with uniformly distributed current paths. The modular segmented structure actually simplifies manufacturing compared to attempting to achieve similar performance in a single large electrode
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 reduces internal resistance, equalizes current density, and improves heat dissipation, facilitating better power performance while maintaining energy density.
Implementation Method 1
one first long side of the two first long sides is provided with a positive electrode current collector; one first short side of the two first short sides is provided with a first tab; and the positive electrode current collector is electrically connected to the first tab
Data Source
AI summary
Provided are cell, method of manufacturing cell, and battery. The cell includes separator, plural positive electrode sheets and plural negative electrode sheets, the positive and negative electrode sheets are alternately stacked, and the separator is interposed between the positive and negative electrode sheets adjacent to each other. Each positive electrode sheet includes two first long sides oppositely disposed, one of which is provided with positive electrode current collector; and two first short sides oppositely disposed, one of which is provided with first tab, the positive electrode current collector is electrically connected to the first tab; and/or each negative electrode sheet includes two second long sides oppositely disposed, one of which is provided with negative electrode current collector; and two second short sides oppositely disposed, one of which is provided with second tab, the negative electrode current collector is electrically connected to the second tab.