Pouch Battery Edge Banding Structure for Insulation and Space Use
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Solution Overview
Problem
Conventional pouch lithium batteries face issues with suboptimal insulation performance of the edge banding, leading to potential short circuits and reduced space utilization, which affects energy density and safety.
Innovation Solution
The battery design incorporates a first bonding body that wraps the cross section of the edge banding, with a higher inner side surface lower edge than the outer side surface, enhancing insulation and abrasion resistance, and a second bonding body between the edge banding and the battery cell body to reduce volume occupation, using a binder cured by heating, moisture, or light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the edge banding is cut to remove redundant parts, then the space utilization is improved, but the insulating performance deteriorates due to exposed metal layer contact
Solution Approach 1:
An insulating adhesive tape is introduced as an intermediary component between the exposed metal layer of the edge banding and external electronic components. This tape acts as a mediator that provides electrical insulation while allowing the edge banding to be cut for compact packaging, thus resolving the contradiction between space utilization and insulating performance.
2Volume of moving object
If the edge banding width is reduced to improve space utilization, then the volume occupation is improved, but the bonding strength and abrasion resistance deteriorate
Solution Approach 1:
The insulating adhesive tape is applied selectively at the lower edge of the edge banding where bonding and abrasion resistance are most critical. This localized application provides enhanced strength and protection precisely where needed, rather than uniformly across the entire edge banding, thus improving bonding strength without significantly increasing volume occupation.
3Reliability
If adhesive paper is used to ensure insulation, then the insulating performance is improved, but the device complexity and production steps increase
Solution Approach 1:
The insulating adhesive tape combines multiple functions into a single component: electrical insulation, bonding the edge banding to the battery cell body, and providing abrasion resistance. This merging of functions eliminates the need for separate adhesive paper and other protective components, thereby improving insulating performance while reducing device complexity and production steps.
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
This design effectively prevents short circuits, improves insulation and energy density, and extends the battery's service life by ensuring stronger bonding and abrasion resistance, while being adaptable to various battery shapes and reducing the need for adhesive paper, thus enhancing safety and production flexibility.
Implementation Method 1
using a binder cured by heating, moisture, or light
Data Source
AI summary
Disclosed is a battery, including a battery cell body and a packaging housing. The packaging housing has an edge banding and a cavity, and the edge banding has a cross section. The edge banding extends upwards along a side surface of the battery cell body, a side surface, close to the battery cell body, of the edge banding is an inner side surface, and a side surface, away from the battery cell body, of the edge banding is an outer side surface. The cross section is provided with a first bonding body, and the first bonding body wraps the cross section, a part of the inner side surface and a part of the outer side surface of the edge banding. A lower edge of the first bonding body on the inner side surface is higher than a lower edge of the first bonding body on the outer side surface.