Pouch Battery Inner-Wall Adhesive for Separator Stability
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Solution Overview
Problem
Pouch-type rechargeable batteries are prone to deformation or impact, leading to potential short circuits and ignitions due to movement of the separator within the electrode assembly.
Innovation Solution
A rechargeable battery design featuring an asymmetric adhesive layer made of photocurable acryl-based adhesive, which is applied to the pouch's inner wall to surround the electrode assembly, filling gaps and securing the separator in place, reducing deformation and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pouch-type battery uses a flexible laminate material case, then the battery can be deformed by external pressure or impact, but this deformation causes separator movement and short circuit risk
Solution Approach 1:
The adhesive layer is applied to the pouch inner wall before inserting the electrode assembly, creating a pre-positioned fixation structure that prevents separator movement during subsequent deformation or impact events
Solution Approach 2:
The adhesive layer acts as an intermediary substance between the pouch case and the electrode assembly, bonding these two components together to prevent relative movement and separator displacement when the pouch undergoes deformation
2Manufacturing precision
If the adhesive layer is formed asymmetrically, then it can better fill gaps between pouch and electrode assembly, but this increases manufacturing complexity
Solution Approach 1:
The adhesive layer is deliberately designed with asymmetric thickness distribution, being thicker at certain positions to fill larger gaps and thinner at other positions, optimizing the fixation effect while adapting to the specific geometry of the electrode assembly and pouch interface
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 adhesive layer effectively prevents separator displacement, minimizing the risk of short circuits and ignitions by maintaining the pouch's shape under external pressure or impact.
Implementation Method 1
The adhesive layer may be a photocurable adhesive. The photocurable adhesive may be an acryl-based adhesive.
Implementation Method 2
The adhesive layer may be deformed according to a shape of a gap between a side wall of the pouch and the electrode assembly, thereby filling the gap. The adhesive layer may be deformed by being pressurized by a weight of the electrode assembly.
Data Source
AI summary
A rechargeable battery includes an electrode assembly, a pouch configured to accommodate the electrode assembly together with an electrolyte, and an adhesive layer configured to connect between the electrode assembly and the pouch, and the adhesive layer is in contact with an inner wall of the pouch.