Pouch Battery Electrode Lead Inclined Surface Detachment
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Solution Overview
Problem
Pouch type secondary batteries face safety issues due to incomplete interruption of electrical connections when internal pressure increases, leading to potential explosions and electrical discharge despite gas generation and pressure buildup.
Innovation Solution
The design includes a pouch type secondary battery with a first electrode lead connected to an electrode tab and a second electrode lead protruding outside, featuring a connection part with a first inclined surface and optional step compensation parts, ensuring complete detachment and interruption of electrical connections when internal pressure rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pouch type secondary battery is used without sufficient protection members, then the device complexity is reduced, but the safety and reliability deteriorate when internal pressure increases
Solution Approach 1:
The electrode lead is divided into multiple segments (first electrode lead, connection part, second electrode lead) that can detach from each other when internal pressure increases, creating a segmented protection mechanism without adding complex external components
Solution Approach 2:
The connection part is designed with dynamic detachment capability through inclined surfaces that allow the electrode lead segments to separate automatically when subjected to internal pressure, transforming a static connection into a dynamic safety mechanism
2Reliability
If the connection part is designed with inclined surfaces for easy detachment, then the safety is improved when internal pressure increases, but the manufacturing precision requirements worsen
Solution Approach 1:
The inclined surface angle is optimized to balance detachment reliability and manufacturing feasibility, allowing automatic separation at specific pressure thresholds while maintaining reasonable manufacturing tolerances
3Reliability
If multiple electrode leads are provided to interrupt electrical connection, then the safety is improved when internal pressure increases, but the device complexity worsens
Solution Approach 1:
The connection part serves multiple functions: it connects electrode leads during normal operation and acts as a detachment mechanism for safety protection, eliminating the need for separate protection members
Data Source
AI summary
A pouch type secondary battery includes: an electrode assembly having an electrode including a positive electrode and a negative electrode and a separator laminated therein; a battery case having a pouch shape to accommodate the electrode assembly; an electrode tab connected to the electrode and protruding from one side of the electrode; a first electrode lead having one end connected to the electrode tab; a second electrode lead having one end connected to the other end of the first electrode lead and the other end protruding to outside the battery case; and a connection part bonding the first electrode lead to the second electrode lead to connect the first and second electrode leads to each other, wherein a first inclined surface is provided on at least one of the other end of the first electrode lead and the one end of the second electrode lead.