Battery Pack Bonding Strength for Reuse Prevention
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Solution Overview
Problem
Existing battery packs with laminate film casing materials can be easily disassembled, allowing unit batteries to be reused, which compromises their intended non-reusable design.
Innovation Solution
A battery pack design where the unit batteries are bonded together with a two-sided adhesive tape having a higher tensile strength than the fusion-bonding portion of the laminate film casing material, ensuring that when disassembled, the fusion-bonding portion is ripped off, rendering the unit battery unusable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unit batteries are bonded with adhesive tape, then the battery pack can be assembled easily, but the battery pack can be easily disassembled allowing unit battery reuse
Solution Approach 1:
The invention changes the strength parameter of the bonding interface by selecting adhesive tape with tensile strength lower than the fusion-bonding portion. This parameter adjustment ensures that when disassembly force is applied, the adhesive tape fails first while the fusion-bonding portion remains intact, preventing unit battery reuse while maintaining easy assembly
Solution Approach 2:
The adhesive tape serves as an intermediary element between unit batteries. It provides the bonding function for easy assembly while its controlled low strength acts as a sacrificial component that fails during disassembly, thereby protecting the fusion-bonding portion and preventing battery reuse
2Ease of operation
If adhesive tape is used to bond unit batteries, then assembly is simplified, but disassembly becomes too easy compromising battery security
Solution Approach 1:
By adjusting the tensile strength parameter of the adhesive tape to be lower than the fusion-bonding portion, the invention creates a controlled weakness that simplifies assembly while preventing unauthorized reuse. The adhesive tape bonds units during assembly but fails first during disassembly, protecting against harmful reuse
Solution Approach 2:
The invention converts the potential harm of easy disassembly into a benefit by designing the adhesive tape to fail in a controlled manner. The easy removal of adhesive tape during disassembly actually serves the benefit of destroying the battery's functionality, as the accompanying damage to the fusion-bonding portion prevents reuse
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
Prevents the reuse of unit batteries by ensuring the fusion-bonding portion is damaged upon disassembly, maintaining the pack's intended non-reusable configuration and enhancing security against unauthorized battery reuse.
Implementation Method 1
a plurality of unit batteries 100 stacked and bonded together with a two-sided adhesive tape 460
Implementation Method 2
a fusion-bonding portion is formed to seal an electrode laminated body that includes a sheet positive electrode, a sheet negative electrode, and a separator, and an electrolytic solution
Data Source
Figure 1~2
Figure 3
Figure 4(A)~4(D)
AI summary
In order to provide a battery pack to which a reuse prevention measure is applied in such a way that unit batteries become damaged and useless after the battery pack is disassembled, a battery pack of the present invention is characterized by including a plurality of unit batteries 100 stacked and bonded together with a two-sided adhesive tape 460, the unit batteries 100 including a laminate film casing material on which a fusion-bonding portion is formed to seal an electrode laminated body that includes a sheet positive electrode, a sheet negative electrode, and a separator, and an electrolytic solution, wherein a bonding strength of the two-sided adhesive tape 460 bonding the unit batteries 100 together is larger than a minimum bonding strength of the fusion-bonding portion.