Pouch Battery Tab Bending With Adhesive Shape Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary batteries face challenges in maintaining the bent shape of electrode leads and optimizing inner space utilization and energy density, particularly in pouch-type batteries.
Innovation Solution
Incorporating a bent portion in the current collector tab with an adhesive member, such as a UV-acrylate adhesive, to fix the shape and enhance space utilization by ensuring the bent portion remains stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the current collector tab is bent to improve space utilization, then the inner space utilization rate improves, but the bent shape becomes unstable and sags over time
Solution Approach 1:
The adhesive member is applied to the current collector tab before the bending process, so that when the tab is bent, the adhesive already in place helps maintain the bent shape and prevents sagging over time
Solution Approach 2:
The adhesive member acts as an intermediary substance between the current collector tab and itself (at the bent region), providing internal support and maintaining the bent shape without requiring external mechanical constraints
2Volume of moving object
If the current collector tab is bent to optimize space, then the inner space utilization rate improves, but the manufacturing process becomes more complex
Solution Approach 1:
The adhesive application and bending operations are combined into an integrated manufacturing process, where the adhesive is applied and the bending is performed in sequence without requiring separate complex fixtures or equipment for each step
Solution Approach 2:
The viscosity and curing properties of the adhesive member are specifically selected to allow application in liquid form during manufacturing, followed by curing to maintain the bent shape, enabling a simple sequential process rather than requiring complex simultaneous operations
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 member maintains the bent shape of the current collector tab, preventing sagging and improving the inner space utilization and energy density of the battery.
Implementation Method 1
an adhesive member formed within a region formed by the bent portion of the current collector tab
Implementation Method 2
the adhesive member may comprise an ultraviolet (UV) adhesive
Data Source
AI summary
The present disclosure relates to a secondary battery capable of increasing the inner space utilization rate of a case and improving energy density. For example, disclosed is a secondary battery including: an electrode assembly including a current collector tab; a case including a main body formed with an accommodation portion configured to accommodate the electrode assembly and a cover configured to cover the main body; and an electrode lead electrically connected to the current collector tab and drawn out of the case, wherein the current collector tab is bent twice to form a bent portion and an end portion protruding from the electrode assembly and an adhesive member is formed within a region formed by the bent portion of the current collector tab.