Pouch Battery Gas Guide Layer for Stronger Electrode Lead Sealing
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Solution Overview
Problem
The adhesive strength between the gas guide portion and the electrode lead in pouch type secondary batteries is insufficient, leading to detachment and potential electrolyte leakage, which compromises the durability and safety of the battery.
Innovation Solution
Incorporating a modified polyolefin resin in the first layer of the gas guide portion that contacts the electrode lead, enhancing the adhesive strength and preventing detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a gas guide portion is disposed at the connection portion between the electrode lead and pouch type film laminate to discharge gas when pressure increases, then gas discharge function is improved, but the adhesive strength between the gas guide portion and the electrode lead is reduced
Solution Approach 1:
The gas guide portion is constructed as a composite structure with a first layer and a second layer. The first layer includes a modified polyolefin resin that provides strong adhesion to the electrode lead, while the second layer provides the gas discharge function. This composite material approach allows both the adhesive strength requirement and the gas discharge function to be satisfied simultaneously.
2Object-generated harmful factors
If the interface between the gas guide portion and the lead film is opened to discharge gas to the outside of the pouch, then gas discharge capability is improved, but the adhesive strength between the gas guide portion and the electrode lead is reduced
Solution Approach 1:
The gas guide portion is segmented into two distinct layers: a first layer that maintains strong adhesive bonding to the electrode lead, and a second layer that provides the gas discharge pathway. This segmentation allows the gas discharge function to be achieved without compromising the adhesive strength at the critical interface between the gas guide portion and the electrode lead.
3Object-generated harmful factors
If the gas guide portion detaches from the electrode lead and is pushed out of the pouch, then gas discharge occurs, but the electrode lead becomes corroded due to electrolyte leaked from the inside of the pouch
Solution Approach 1:
The composite structure of the gas guide portion with a modified polyolefin resin in the first layer ensures strong and reliable adhesion to the electrode lead, preventing detachment even under high pressure conditions. This reliable bonding maintains the integrity of the pouch structure, preventing electrolyte leakage and subsequent corrosion of the electrode lead, thereby ensuring the durability and safety of the battery.
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 modified polyolefin resin improves the adhesive strength between the gas guide portion and the electrode lead, preventing electrolyte leakage and corrosion, thereby enhancing the durability and safety of the pouch type secondary battery.
Implementation Method 1
the first layer includes a modified polyolefin resin
Data Source
AI summary
A secondary battery includes an electrode assembly, a pouch type case including an accommodation portion for accommodating the electrode assembly and a sealing portion for sealing the accommodation portion, an electrode lead connected to the electrode assembly and protruding to the outside of the pouch type case via the sealing portion, a lead film disposed between the electrode lead and the pouch type case, and a gas guide portion disposed between the electrode lead and the lead film. The gas guide portion includes a first layer having a modified polyolefin resin in contact with the electrode lead, and a second layer disposed on the first layer.