Pouch Battery Polyurea Buffer Structure for Sealing Stability
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Solution Overview
Problem
The volume change of the electrode body in batteries due to charging and discharging leads to increased stress on the laminate outer encasements, compromising their sealing performance.
Innovation Solution
Incorporating buffer members made of polyurea resin between the electrode body and the laminate outer encasement to absorb volume changes, thereby reducing stress on the encasements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode body is directly enclosed by the laminate outer encasement without buffer members, then the battery structure is simple, but the sealing performance of the laminate outer encasement deteriorates due to volume change stress
Solution Approach 1:
A buffer member containing a polyurea resin is introduced as an intermediary component between the electrode body and the laminate outer encasement. This buffer member absorbs the volume change of the electrode body during charging and discharging, preventing direct stress transmission to the encasement and thereby maintaining sealing performance without significantly complicating the overall structure.
Solution Approach 2:
The buffer member is pre-installed between the electrode body and the laminate outer encasement to provide cushioning before volume change stress occurs. The polyurea resin material is specifically selected for its ability to absorb expansion and contraction forces, protecting the encasement sealing from damage during battery operation.
2Reliability
If buffer members containing polyurea resin are added between the electrode body and laminate outer encasement, then the sealing performance is maintained, but the device complexity increases
Solution Approach 1:
The buffer member is segmented into multiple parts (first buffer member, second buffer member, and third buffer member) that are strategically positioned at different locations around the electrode body. This segmentation allows the buffer function to be distributed effectively while using a standardized component design, balancing the need for protection with structural considerations.
Solution Approach 2:
The buffer member is designed to perform multiple functions: it absorbs volume change stress, maintains sealing performance, and provides mechanical support. The polyurea resin material offers both cushioning properties and adhesion to the electrode body and encasement, reducing the need for additional specialized components.
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 use of polyurea resin buffer members effectively suppresses the volume change of the electrode body, maintaining the sealing performance of the laminate outer encasements during charging and discharging.
Implementation Method 1
a first buffer member which contains a polyurea resin and is disposed between the first surface and the laminate outer encasement that faces the first surface in the thickness direction
Data Source
AI summary
In the present disclosure, there is provided a battery including an electrode body and a laminate outer encasement covering the electrode body, wherein the electrode body includes a first surface and a second surface opposed to the first surface in a thickness direction, and the battery includes a first buffer member containing a polyurea resin between the first surface and the laminate outer encasement opposed to the first surface in the thickness direction.