Pouch Battery Casing Layout for Compact Cells and Perpendicular Cooling
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Solution Overview
Problem
Existing pouch secondary batteries face challenges in achieving high energy density, reduced volume, and extended lifespan, particularly when exposed to high temperatures, and require improved cooling efficiency.
Innovation Solution
A pouch secondary battery design with a reduced volume casing that seals on three sides and includes an adhesion portion and extending portions, allowing electrode tabs to protrude, made from materials like aluminum or aluminum alloy, with a concave portion for enhanced heat transfer and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sealing portion volume is reduced to achieve higher energy density, then the battery occupies less space, but the sealing reliability may deteriorate
Solution Approach 1:
The sealing portion is divided into multiple sealing regions (first sealing region, second sealing region, third sealing region) that seal different sides of the electrode assembly separately. This segmentation allows each sealing region to be optimized independently, maintaining reliable sealing of critical areas while minimizing overall sealing material volume to reduce battery size.
Solution Approach 2:
Different sealing regions are applied to different locations based on local requirements. The first sealing region seals the long side where electrode tabs protrude, the second sealing region seals another long side, and the third sealing region seals the short side. This localized sealing approach ensures reliable sealing where needed while reducing unnecessary sealing material elsewhere, achieving both reliability and volume reduction.
2Weight of stationary object
If the casing volume is reduced to decrease overall battery weight, then energy density improves, but the cooling efficiency may worsen
Solution Approach 1:
Cooling plates are arranged in multiple dimensions including perpendicular to the electrode assembly stacking direction. The first cooling plate is arranged perpendicular to the stacking direction, creating three-dimensional heat dissipation pathways. This multi-dimensional cooling approach efficiently removes heat from the compact battery structure without requiring excessive casing volume, thus maintaining cooling efficiency while reducing battery weight.
3Volume of moving object
If the battery design is optimized for high energy density with reduced volume, then space utilization improves, but the complexity of fabrication may increase
Solution Approach 1:
The casing is formed with pre-defined sealing portions and cooling plate arrangement structures before electrode assembly insertion. The sealing portions are pre-positioned at specific locations (first sealing region on one long side, second sealing region on another long side, third sealing region on short side), and cooling plates are pre-arranged in the casing. This preliminary preparation simplifies the assembly process despite the complex final structure, as components are already positioned correctly before final assembly.
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 design enhances energy density, reduces overall volume and weight, and improves cooling efficiency by allowing perpendicular cooling plate arrangement, thus addressing the challenges of high energy density and thermal stability.
Implementation Method 1
a pouch secondary battery including a casing configured to enclose an electrode assembly
Implementation Method 2
improves cooling efficiency by allowing perpendicular cooling plate arrangement
Data Source
AI summary
A pouch secondary battery is disclosed. One aspect of the present invention provides a pouch secondary battery including a casing configured to accommodate an electrode assembly from which electrode tabs are led; and the casing includes a sealing portion formed on three sides of four sides of the pouch secondary battery and an adhesion portion formed on the remaining one side; and an extending portion protruding perpendicularly with respect to the adhesion portion is formed in a portion adjacent to the adhesion portion in the sealing portion.