Battery Lead Insulation Film Venting for Gas Release and Sealing
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Solution Overview
Problem
Existing secondary batteries face safety issues due to gas generation and water infiltration, leading to performance degradation and reduced lifespan, with existing venting methods compromising battery life and increasing costs.
Innovation Solution
A secondary battery design with a vent portion on the insulation film, formed using a non-adhesive material on the electrode leads, allows efficient gas discharge while minimizing water ingress, using a simple roll pressing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent portion is formed in a secondary battery to release gases to the outside, then safety is improved, but battery life is reduced significantly
Solution Approach 1:
The patent applies local quality by treating only a specific portion of the insulation film with a non-adhesive material to create a vent portion, while the rest of the insulation film maintains its adhesive properties for sealing. This localized treatment allows gas release at the vent portion while preserving battery life through maintained sealing at other areas.
Solution Approach 2:
The vent portion is created by applying a non-adhesive material to the insulation film, forming a porous or non-sealing region that allows gas permeation. This enables the battery to vent gases safely while the surrounding adhesive insulation film maintains the seal to preserve battery life.
2Quantity of substance
If energy density is increased in lithium secondary batteries, then power storage capacity is improved, but gas generation inside the battery increases
Solution Approach 1:
The patent converts the harmful effect of gas generation into a beneficial feature by designing a vent portion that actively manages gas release. The non-adhesive material creates a controlled pathway for gases generated from high energy density batteries to escape safely, transforming the problem of increased gas generation into a manageable characteristic.
3Object-affected harmful factors
If water infiltrates into secondary batteries, then side reactions occur, but performance degradation and gas generation are accelerated
Solution Approach 1:
The insulation film with the vent portion acts as an intermediary barrier that manages water infiltration. The non-adhesive vent portion allows controlled permeation while the surrounding adhesive portions maintain sealing, creating a balanced interface that reduces harmful side reactions from water infiltration while preventing excessive gas generation.
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 vent portion enhances safety by efficiently releasing gases, maintaining battery life and preventing electrolyte leakage, while being cost-effective and process-efficient.
Implementation Method 1
at least one insulation film of the positive electrode insulation film and the negative electrode insulation film has a vent portion surface-treated with a non-adhesive material between the insulation film and the positive electrode lead or the negative electrode lead
Implementation Method 2
the vent portion may be a coating layer formed by transferring a non-adhesive material from a roll onto the insulation film through roll pressing
Implementation Method 3
the non-adhesive material may be a material cured after coating a polymer having a melting point of 220°C or higher
Implementation Method 4
or gelled ceramic particles, and particularly, may be a material cured after coating at least one polymer selected from the group consisting of a polyimide-based material, polytetrafluoroethylene and polymethyl pentene, or at least one ceramic particle selected from the group consisting of SiO 2 , TiO 2 , ZnO, CaO and BaO in a gelled state
Data Source
Figure 1(a)~1(d)
Figure 2
Figure 3
AI summary
Provided is a secondary battery which includes an electrode assembly including a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, and received in a battery casing together with an electrolyte, wherein the positive electrode includes a positive electrode tab, and the negative electrode includes a negative electrode tab, the positive electrode tab is connected electrically to a positive electrode lead, the negative electrode tab is connected electrically to a negative electrode lead, and the positive electrode lead and the negative electrode lead are exposed to the outside through a sealing portion of the battery casing, each of a positive electrode insulation film and a negative electrode insulation film is attached to a portion where each of the positive electrode lead and the negative electrode lead is in contact with the sealing portion of the battery casing, and at least one insulation film of the positive electrode insulation film and the negative electrode insulation film has a vent portion surface-treated with a non-adhesive material between the insulation film and the positive electrode lead or the negative electrode lead, at the portion where the positive electrode lead or the negative electrode lead is attached.