Pouch Battery Lead Geometry for Heat and Sealing Reliability
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Solution Overview
Problem
Pouch type rechargeable batteries face issues with lead size limitations, leading to increased current generation and stability problems, as well as heat generation and sealing failures due to the lead's resistance.
Innovation Solution
The design includes a lead with a third region that overlaps the sealing portion of the case, featuring a wider width and thinner thickness than the first and second regions, which reduces resistance and prevents sealing failures by optimizing the lead's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lead size is reduced to fit the pouch type rechargeable battery, then the battery size and weight are reduced, but the current generation through the lead increases causing stability problems
Solution Approach 1:
The lead is designed with different cross-sectional areas in different regions: a first cross-sectional area in the first region, a second cross-sectional area in the second region, and a third cross-sectional area in the third region. This local variation in geometry allows optimization of current distribution and resistance characteristics in each specific region, resolving the contradiction between small overall size and stable current generation.
2Weight of moving object
If the lead size is reduced, then the battery weight is reduced, but the resistance of the lead increases generating more heat
Solution Approach 1:
The lead features varying cross-sectional areas in different regions, with the third region having a third cross-sectional area that is greater than or equal to the first cross-sectional area. This local thickening in the third region reduces resistance and heat generation at critical locations while maintaining overall lightweight design.
3Length of stationary object
If the lead size is reduced, then the battery dimensions are reduced, but sealing failure occurs due to the lead
Solution Approach 1:
The lead is designed with a third region having a third cross-sectional area that is greater than or equal to the first cross-sectional area, positioned at the sealing portion. This local geometric optimization ensures proper sealing contact and prevents sealing failure while maintaining compact overall dimensions.
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 the lead's resistance, minimizing heat generation and preventing sealing failures, thereby enhancing the stability and performance of the pouch type rechargeable battery.
Implementation Method 1
the third region has a width greater than that of the first region and the second region in a second direction and has a thickness smaller than that of the first region and the second region in a third direction
Data Source
AI summary
A rechargeable battery includes an electrode assembly; a case having a sealing portion surrounding the electrode assembly; and a lead electrically connected to the electrode assembly and extending in a first direction, wherein the lead includes a first region in contact with the electrode assembly and located inside the case; a second region exposed to an outside of the case; and a third region located between the first region and the second region and overlapping the sealing portion of the case, wherein the third region has a width greater than that of the first region and the second region in a second direction and has a thickness smaller than that of the first region and the second region in a third direction, and wherein the second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and the second direction.