Pouch Battery Insulating Member Alignment Mark
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Solution Overview
Problem
Secondary batteries, particularly those with lithium metal, face safety concerns due to high reactivity, and existing manufacturing methods lead to inconsistent insulation, affecting productivity and reliability by allowing incorrect attachment of insulating members, which can result in short circuits and damage.
Innovation Solution
A pouch-type secondary battery design featuring an electrode assembly with a battery case having a sealing part with alignment marks for precise attachment of an insulating member and adhesive, ensuring correct positioning and preventing short circuits, with a non-insulating part extending past the insulating member to avoid damage during device fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating member is attached to the sealing part to prevent short circuits, then safety is improved, but the insulating member may be damaged during device fastening if it extends too far
Solution Approach 1:
The sealing part is designed with differentiated regions: an insulating region where the insulating member is attached to prevent short circuits, and a non-insulating region that extends outward to serve as the fastening portion. This local differentiation allows the insulating member to be protected from damage during device assembly while maintaining its safety function.
2Reliability
If the insulating member covers the entire sealing part to maximize insulation, then short circuit prevention is improved, but the fastening portion cannot be properly attached to the device
Solution Approach 1:
The sealing part is segmented into two functional regions: a first sealing part for insulation where the insulating member is attached, and a second sealing part for mechanical fastening that remains exposed. This segmentation allows both insulation and assembly functions to be fulfilled without interference.
3Manufacturing precision
If alignment marks are added to the sealing part to ensure precise insulating member attachment, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Alignment marks are added to the sealing part to provide visual guidance for precise attachment of the insulating member during manufacturing. These marks serve as reference indicators that simplify the assembly process and ensure correct positioning without requiring complex alignment mechanisms.
Data Source
AI summary
A secondary battery may include an electrode assembly, the electrode assembly including first and second electrode plates and a separator interposed between the electrode plates; a battery case, the battery case including an accommodating part and a sealing part formed along an edge of the accommodating part, the accommodating part accommodating the electrode assembly; an insulating member attached to the sealing part, the insulating member covering and insulating the sealing part; and an alignment mark on at least one region of the sealing part, the alignment mark identifying a position on the sealing part at which a predetermined portion of the insulating member is aligned, wherein a non-insulating part of the sealing part extends past the insulating member.