Pouch Cell Seal Edge Structure for Impact-Resistant Packaging
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Solution Overview
Problem
The folded seal edge structure in pouch cell batteries is prone to puncture upon impact, leading to damage and safety hazards, while also reducing energy density.
Innovation Solution
An electrochemical device design featuring a seal edge portion with folded sections and an adhesive component that wraps the second end, buffering impact forces and preventing direct contact with the lateral edge, thereby enhancing safety and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the seal edge structure is trimmed and folded to wrap the internal battery cell structure, then the width of the battery is reduced and energy density is increased, but the folded edge structure is prone to puncture the packaging shell when the battery is dropped or subjected to impact
Solution Approach 1:
The patent applies beforehand cushioning by introducing an adhesive component at the folded edge structure before impact occurs. The adhesive component is applied to the packaging shell at the location where the folded edge may puncture, creating a protective cushion that absorbs impact forces and prevents puncture damage when the battery is dropped or subjected to external forces.
Solution Approach 2:
The adhesive component serves as an intermediary between the folded edge structure and the packaging shell. It mediates the interaction by providing a bonding layer that secures the folded edge to the packaging shell, preventing the folded edge from moving independently and puncturing the shell during impact events.
2Productivity
If the folded edge structure is used to reduce battery width, then energy density is increased, but the folded edge may directly contact and damage the lateral edge of the main portion
Solution Approach 1:
The adhesive component acts as an intermediary between the folded edge structure and the lateral edge of the main portion. It bonds the folded edge to the packaging shell, preventing direct contact and harmful interaction between the folded edge and the lateral edge during normal operation and impact events.
Solution Approach 2:
The adhesive component is a relatively simple, inexpensive material that provides protective function throughout the battery's service life. It is applied as a consumable element that secures the folded edge structure and prevents damage without requiring complex or expensive protective mechanisms.
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 adhesive component effectively seals and buffers impact forces, reducing damage risk and maintaining energy density by optimizing the packaging shell's structural integrity and aesthetic appearance.
Implementation Method 1
The adhesive component is adhered between the lateral edge of the main portion and the second section
Implementation Method 2
the adhesive component can bear and buffer an impact force of the second end on the main portion
Data Source
AI summary
An electrochemical device includes an electrode assembly, a packaging shell, and an adhesive component. The packaging shell includes a main portion and a seal edge portion. The electrode assembly is disposed in the main portion. The seal edge portion includes a first section and a second section that are folded. The second section includes a first end and a second end. The first section connects the main portion and the first end. The second end is disposed between the first section and a lateral edge of the main portion. The adhesive component is adhered between the lateral edge of the main portion and the second section. The second section is connected to the adhesive component. Along a thickness direction of the electrode assembly, an end of the adhesive component extends beyond the second end of the second section, and the adhesive component wraps the second end.