Battery Electrode Assembly Adhesive Bonding for Drop Impact Protection
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Solution Overview
Problem
Secondary batteries are prone to damage due to impact, particularly at the edge portions of the electrode assembly where the binder is not present, leading to potential curling or tearing of the separator and risk of short circuits upon dropping.
Innovation Solution
An adhesive part is applied to the outermost regions of the electrode assembly, covering the boundary lines between the electrodes and the separator, and bonded to the case, enhancing the adhesion strength and minimizing damage from impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode assembly is made without binder coating on edge portions to reduce material cost, then manufacturing cost is reduced, but the edge portions become vulnerable to impact causing curling or tearing of the separator
Solution Approach 1:
The adhesive part is applied specifically to the edge portions of the electrode assembly where binder is typically not present. This localized application provides impact protection precisely where it is needed most (at the vulnerable edges) without requiring binder coating on the entire electrode assembly, thus maintaining cost efficiency while improving reliability at critical locations.
2Reliability
If protective tapes are applied to the electrode assembly to reduce impact damage, then impact resistance is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The adhesive part serves multiple functions simultaneously: it acts as a protective element against impact damage, provides bonding between the electrode assembly and case, and eliminates the need for separate protective tapes. This merging of functions reduces structural complexity and manufacturing steps while maintaining improved impact resistance.
3Reliability
If the adhesive part covers a larger area of the electrode assembly, then impact protection is improved, but the area occupied by active electrode material is reduced
Solution Approach 1:
The adhesive part is applied to cover the edge portions and boundary lines of the electrode assembly, which represents a partial coverage rather than complete coverage. This partial action is sufficient to provide the necessary impact protection at the most vulnerable locations (edges and boundaries) without unnecessarily reducing the area available for active electrode material.
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 part significantly reduces stress on the electrode assembly during drops, minimizing curling and separation of components, thereby preventing short circuits and enhancing the safety of the secondary battery.
Implementation Method 1
an adhesive part on an outermost region of the electrode assembly, wherein the adhesive part is provided to cover a boundary line between the negative electrode plate and the separator or between the positive electrode plate and the separator, and is bonded to the case
Data Source
AI summary
A secondary battery includes: an electrode assembly including a negative electrode plate, a positive electrode plate, and a separator between the negative electrode plate and the positive electrode plate; and a case accommodating the electrode assembly. The electrode assembly includes an adhesive part on an outermost region of the electrode assembly. The adhesive part is arranged to cover a boundary line between the negative electrode plate and the separator or between the positive electrode plate and the separator, and is bonded to the case.