Superwide Pouch Battery Double Tab Segmentation
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Solution Overview
Problem
Superwide pouch type secondary batteries face increased internal resistance and heat generation due to elongated length between electrode tabs, leading to decreased performance and lifespan, while existing solutions fail to maintain energy density and space efficiency.
Innovation Solution
A superwide pouch type secondary battery design featuring multiple cathode and anode tabs with gradually decreasing thicknesses, surrounded by sealing films, and a specific configuration that maintains low internal resistance by optimizing tab connections and pouch sealing, allowing for increased width without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the length between electrode tabs is increased to achieve a wide battery cell, then the width of the battery cell is improved, but the internal resistance increases and power consumption increases
Solution Approach 1:
The patent divides the electrode tabs into multiple segments (first electrode tab and second electrode tab) instead of using a single long tab. This segmentation reduces the length of each individual tab while maintaining the overall wide battery cell width, thereby reducing internal resistance and power consumption while achieving the desired width for space efficiency in vehicle applications.
2Length of stationary object
If the length between electrode tabs is increased to achieve a wide battery cell, then the width of the battery cell is improved, but temperature difference across regions increases and performance decreases
Solution Approach 1:
By segmenting the electrode tabs into multiple shorter tabs, the current distribution is improved and heat generation is more uniform across the battery cell. This reduces the temperature difference between different regions of the battery cell, preventing localized overheating and maintaining consistent performance across the entire cell.
3Length of stationary object
If the length between electrode tabs is increased to achieve a wide battery cell, then the width of the battery cell is improved, but the lifespan of the battery decreases
Solution Approach 1:
The segmented electrode tab structure reduces internal resistance and improves current distribution, which decreases heat generation and reduces thermal stress on the battery components. This leads to reduced degradation over time and extends the lifespan of the battery while maintaining the wide cell width needed for vehicle floor installation.
Data Source
AI summary
Provided is a superwide pouch type secondary battery comprising an electrode assembly including a cathode plate, an anode plate, and a separator; a pouch surrounding the electrode assembly; and electrode tabs connected to both ends of the electrode assembly and protruding outward of the pouch, wherein the electrode tabs connected to the both ends of the electrode assembly include one or more cathode tabs and anode tabs, respectively, and width of battery cell is more than 4 times longer than height of battery cell such that loading efficiency of the pouch type secondary battery into a vehicle and an energy density may be improved without increasing an internal electrode.