Pouch Battery Electrode Lead Detachment for Pressure Control
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Solution Overview
Problem
Pouch type secondary batteries lack effective control over internal pressure when two-stage electrode leads are detached, leading to inconsistent pressure interruption and compromised safety reliability.
Innovation Solution
Incorporating a fusion prevention part on the first electrode lead, connected to a conductive polymer connection part and an insulation part, which allows for adjustable control of internal pressure by detaching the electrode leads, maintaining constant pressure through specific bonding forces and surface treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-stage electrode leads are used to physically interrupt electrical connection when case expands, then safety protection is improved, but internal pressure control becomes inconsistent and unreliable
Solution Approach 1:
The electrode lead is designed with different local properties: most of the lead maintains strong bonding for electrical connection, while a specific localized region (the detachment portion) has reduced bonding strength through surface treatment or material differentiation. This allows the lead to detach at a predetermined location when internal pressure increases, providing consistent pressure control while maintaining overall safety reliability.
Solution Approach 2:
The electrode lead is pre-configured with a detachment portion that has predetermined bonding characteristics before the battery is assembled. This preliminary design ensures that when internal pressure reaches a certain threshold during battery expansion, the lead will detach at the predetermined location, providing consistent and controllable pressure interruption without requiring additional control mechanisms.
2Adaptability or versatility
If electrode leads are made detachable for safety, then pressure release capability is improved, but control precision over detachment pressure is reduced
Solution Approach 1:
By creating a localized detachment portion with specific surface treatment or material properties, the invention enables precise control over the pressure at which detachment occurs. The detachment portion's unique characteristics ensure that it will separate at a predetermined pressure threshold, providing both adaptability for pressure release and precision for controlling the detachment pressure.
3Reliability
If insulation part is fused around electrode leads for secure connection, then electrical connection reliability is improved, but pressure control capability is reduced
Solution Approach 1:
The insulation part is designed to surround the electrode lead except at the detachment portion, where it intentionally leaves the lead exposed or with reduced bonding. This local differentiation allows the insulation to provide secure electrical connection in most areas while enabling pressure-controlled detachment at the specific location, maintaining connection reliability without sacrificing pressure control capability.
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
Enables controlled and consistent internal pressure management in pouch type secondary batteries, enhancing safety reliability by ensuring predictable detachment of electrode leads and maintaining sealing integrity.
Implementation Method 1
a fusion prevention part located at a position at one surface of the first electrode lead, the fusion prevention part preventing the first electrode lead from being fused to the insulation part
Data Source
AI summary
A pouch type secondary battery according to the present invention includes: an electrode assembly; a battery case accommodating the electrode assembly in an inside thereof; an electrode tab protruding from the electrode assembly; a first electrode lead having an inner end connected to the electrode tab; a second electrode lead having an inner end coupled to an outer end of the first electrode lead and an outer end extending outside of the battery case; a connection part coupling the first and second electrode leads to each other; an insulation part fused around a portion of each of the first and second electrode leads, the insulation part bonding the first and second electrode leads to the battery case; and a fusion prevention part located at a position at one surface of the first electrode lead, the fusion prevention part preventing the first electrode lead from being fused to the insulation part.