Thick Pouch Battery Cell Structure for Pressure and Insulation
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Solution Overview
Problem
Pouch-type battery cells face challenges in durability, safety, pressure resistance, and heat dissipation, limiting their thickness and performance in applications requiring high energy density.
Innovation Solution
A pouch-type battery cell design featuring a terrace structure for leads, insulating tape coverage, and a gas pocket to enhance durability and insulation, allowing for a thickness greater than 20 mm while maintaining formability and insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pouch-type battery cells use flexible packaging materials to achieve weight reduction and higher energy density, then space utilization and energy density improve, but durability, safety, pressure resistance, and heat dissipation performance deteriorate
Solution Approach 1:
The patent applies composite materials by combining the flexible pouch packaging with a foam filling material. The foam material provides structural support, pressure resistance, and heat dissipation capabilities while the pouch maintains flexibility and space utilization. This composite structure resolves the contradiction by integrating the advantages of both flexible packaging and rigid protective structures.
Solution Approach 2:
The foam filling material acts as an intermediary between the electrode assembly and the external environment. It mediates the mechanical stresses and thermal conditions, providing protection to the battery cell while maintaining the flexible pouch structure. This intermediary element enables the pouch to achieve both flexibility and durability.
2Strength
If pouch-type battery cells increase thickness to improve durability and stability, then pressure resistance and heat dissipation improve, but formability and insulation performance deteriorate
Solution Approach 1:
The patent applies local quality by providing structural support through foam filling only in specific regions where needed, rather than making the entire pouch rigid. The foam material is positioned to provide local reinforcement for pressure resistance and heat dissipation, while other regions maintain the flexibility and formability of the pouch structure.
3Temperature
If pouch-type battery cells increase thickness to improve durability and stability, then heat dissipation performance improves, but insulation performance deteriorates
Solution Approach 1:
The patent applies local quality by using foam filling material with specific thermal and insulating properties in targeted areas. The foam provides heat dissipation pathways while maintaining electrical insulation. This localized application allows the battery cell to achieve improved heat dissipation without compromising insulation performance in critical regions.
Data Source
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AI summary
Disclosed are a pouch-type battery cell which is thick and thus has improved durability and stability while maintaining the formability and insulation performance of a pouch and a vehicle including the same. The battery cell includes an electrode assembly formed by overlapping a plurality of electrodes, a packaging material folded to wrap around the electrode assembly to form a rectangular pouch, a sealing part formed by overlapping and contacting edges of the folded packaging material in which the electrode assembly is wrapped, and a pair of leads whose ends are connected to the plurality of electrodes inside the packaging material and whose other ends are exposed to the outside of the packaging material. The pair of leads are exposed in the same direction.