Bent Electrode Terminal in Pouch Battery Cell
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing pouch-type lithium ion polymer batteries have a reduced energy density per unit volume due to protruded electrode terminals, which occupy additional space and hinder efficient packing.
Innovation Solution
The battery cell design incorporates a bent electrode terminal structure where the terminal protrudes through a sealing surplus part of the battery case, allowing it to contact either surface of the case, thereby minimizing the space occupied and enhancing energy density per unit volume. This is achieved by forming the battery case with a sheet-shaped structure and using adherence members like double-sided adhesive tape to maintain the bend and contact state of the electrode terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal protrudes through the sealing surplus part, then the electrical connection is established, but the space occupied increases and energy density per unit volume decreases
Solution Approach 1:
The electrode terminal is bent into a U-shape configuration, changing its spatial arrangement from a straight protrusion to a folded structure. This dimensional change allows the terminal to contact both inner and outer surfaces of the sealing surplus part, establishing reliable electrical connection while minimizing the volume occupied by the protrusion.
Solution Approach 2:
The electrode terminal is formed with a curved or bent shape rather than a straight configuration. This curvature allows the terminal to follow the surface contour of the sealing surplus part, maintaining contact with both inner and outer surfaces while reducing the overall space required for the protrusion.
2Reliability
If the sealing surplus part is formed to seal the battery case, then the sealing performance is improved, but the protruded electrode terminal cannot be bent in the receiving unit direction
Solution Approach 1:
The electrode terminal is divided into distinct functional segments: a first portion that contacts the inner surface of the sealing surplus part, a bent intermediate portion, and a second portion that contacts the outer surface. This segmentation allows each part to fulfill its specific function while maintaining overall structural integrity and sealing performance.
Solution Approach 2:
The bent electrode terminal is positioned such that it nests within the sealing surplus part structure, with the terminal's bent portion fitting into the space between the inner and outer surfaces of the sealing surplus part. This nesting arrangement allows the terminal to maintain contact with both surfaces without compromising the sealing function.
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
The bent electrode terminal configuration effectively minimizes the space occupied by protrusions, leading to improved energy density per unit volume in the battery cell, optimizing its packing efficiency and performance.
Implementation Method 1
using adherence members like double-sided adhesive tape to maintain the bend and contact state of the electrode terminal
Data Source
AI summary
The present invention provides a battery cell including: an electrode assembly configured of a positive electrode, a negative electrode, and a separation membrane; and a battery case in which a sealing surplus part is formed at an external circumference in a state that the electrode assembly is built in a receiving unit, wherein the battery case is formed of a sheet-shaped structure having a first surface and a second surface opposite to the first surface, an electrode terminal of the sheet-shaped structure is protruded through one side sealing surplus part of the battery case, and the electrode terminal is in contact with one surface or the other surface opposite to the one surface of the sealing surplus part in a state that the electrode terminal is bent in the first surface direction or the second surface direction of the battery case at the protrude part.