Pouch Battery Cell Segmentation for Output Stability
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Solution Overview
Problem
Pouch type battery cells experience a reduction in output when their length is increased due to increased electron movement distance, which affects energy density and performance.
Innovation Solution
The design includes overlapping negative and positive electrodes with a separator in between, paired terminals protruding from opposite ends, and lead tabs that extend and are insulated to reduce electron travel distance, allowing for efficient electron transfer and output maintenance despite increased length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the length of the pouch type battery cell is increased to maximize energy density, then the energy density is improved, but the output of the battery cell is reduced due to increased electron movement distance
Solution Approach 1:
The patent divides the battery cell into multiple segments by providing a plurality of positive electrodes and a plurality of negative electrodes arranged in parallel, with multiple collectors distributing current collection points along the length of the electrodes. This segmentation reduces the electron movement distance within each segment while maintaining the overall length of the battery cell, thereby preserving output performance while maximizing energy density.
2Length of stationary object
If the length of the pouch type battery cell is increased, then the energy density is improved, but the movement distance of electrons is increased leading to reduced output
Solution Approach 1:
The battery cell is segmented into multiple sections with multiple electrode pairs and collectors positioned at different locations along the length. This creates multiple shorter current paths parallel to each other, reducing the maximum electron movement distance while maintaining the overall cell length for high energy density.
Solution Approach 2:
The patent introduces a dimensional solution by arranging collectors not just at the ends but distributed along the length of the electrodes in the longitudinal direction. This transforms the single-path electron transport into a multi-path three-dimensional current distribution network, reducing electron travel distance without compromising cell length.
3Quantity of substance
If the length of the pouch type battery cell is increased, then the energy density is improved, but the electrical resistance increases reducing output performance
Solution Approach 1:
Multiple collectors are positioned at different locations along the electrodes to divide the current collection into several parallel paths. This segmentation reduces the electrical resistance of each individual path while maintaining the overall cell length, thereby preserving output performance despite increased cell length for higher energy density.
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 maintains output performance by reducing electrical resistance and electron travel distance, preventing output decrease as the battery cell length is extended.
Implementation Method 1
a separator and an electrolyte... a separator disposed between the negative electrode portion and the positive electrode portion
Implementation Method 2
a pouch type battery cell includes a positive electrode, a negative electrode, a separator and an electrolyte
Data Source
AI summary
A pouch type battery cell is provided. The battery cell includes a negative electrode and a positive electrode that overlap each other while spaced apart from each other. The negative electrode includes a pair of negative terminals that protrude from a first side of opposite ends of the negative electrode. Additionally, the positive electrode includes a pair of positive terminals that protrude from a second side of opposite ends of the positive electrode.