Current Collector Tab Adhesive Fixing for Compact Secondary Batteries
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Solution Overview
Problem
Existing secondary batteries face challenges in optimizing the inner space utilization rate and energy density due to issues with the bent shape of the electrode lead, leading to potential sagging or lifting of the current collector tabs.
Innovation Solution
Incorporating an adhesive member, such as a UV-acrylate adhesive, to fix the bent portion of the current collector tab, ensuring it maintains its shape and enhances space utilization within the battery case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the current collector tab is bent to optimize space utilization, then the inner space utilization rate improves, but the bent shape may sag or deform leading to reduced reliability
Solution Approach 1:
The adhesive member is applied to the current collector tab before bending, or the bent shape is fixed immediately after bending while the adhesive is still effective. This preliminary action ensures the bent portion maintains its optimized shape without subsequent sagging or deformation, resolving the contradiction between space utilization and shape stability.
Solution Approach 2:
The adhesive member acts as an intermediary substance that bonds the current collector tab to itself or to the battery case at the bent portion. This intermediary material provides the necessary holding force to maintain the bent shape against gravitational and operational forces, enabling both compact configuration and reliable shape retention.
2Volume of moving object
If the current collector tab is bent to reduce volume, then the battery compactness improves, but the structural strength of the tab may be compromised
Solution Approach 1:
The adhesive member is applied before or during the bending process to provide immediate structural support. This preliminary reinforcement allows the tab to be bent into a compact configuration while the adhesive prevents excessive deformation or breaking, thus achieving volume reduction without compromising structural strength.
Solution Approach 2:
The adhesive member serves as a reinforcing intermediary that distributes mechanical stresses across the bent portion. By bonding adjacent surfaces together, the adhesive creates a composite structure that maintains structural integrity even in the compacted bent state, resolving the contradiction between volume reduction and strength preservation.
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 effectively maintains the bent shape of the current collector tab, preventing sagging and increasing the inner space utilization rate and energy density of the secondary battery.
Implementation Method 1
an adhesive member formed to correspond to the bent portion
Implementation Method 2
the adhesive member may include an ultraviolet (UV) adhesive
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
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 having a bent portion formed by bending at least once and having a protruding bent end portion; 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 end portion of the current collector tab and drawn out of the case, and further comprising an adhesive member formed to correspond to the bent portion.