Battery Roll Assembly Core Stability and Dust Reduction
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Solution Overview
Problem
Conventional methods for assembling lithium-ion secondary battery rolls face issues such as core disassembly during transportation due to vibration and increased size, and generate dust due to friction between hard materials, which affects efficiency and reliability.
Innovation Solution
A method involving a core member with a specific length and protruding sections from lateral plates, ensuring the core is securely passed through rolls and plates without protruding excessively, and using a buffering material to absorb vibrations and prevent abrasion, thereby maintaining assembly integrity and reducing dust generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner core is lengthened to prevent falling off during transportation, then the reliability of the assembly is improved, but the volume of the roll assembly increases, decreasing transportation efficiency
Solution Approach 1:
The invention divides the core structure into two functional parts: a basic core member that fits within the roll assembly volume, and separate protruding sections from lateral plates that extend beyond the rolls to prevent disassembly. This segmentation allows the core to provide both structural support and anti-disassembly function without increasing the roll assembly volume.
Solution Approach 2:
The lateral plates with protruding sections act as intermediaries between the core member and the disassembly prevention function. Instead of extending the core member itself, the protruding sections from lateral plates serve as mediators that block the core from being removed, thereby preventing disassembly without increasing the core member length or roll assembly volume.
2Strength
If hard materials are used for the branch pole section and screw jig to ensure structural strength, then the strength is improved, but dust is generated due to collision and friction during transportation
Solution Approach 1:
The invention replaces the reusable hard screw jig with a disposable buffering material that is screwed onto the branch pole section. This buffering material serves as a sacrificial element that absorbs friction and collision during transportation, protecting the hard branch pole section from generating dust while maintaining structural strength.
Solution Approach 2:
The invention converts the potential harm of friction and collision into a beneficial protective function. The buffering material is designed to undergo controlled friction and collision, absorbing the energy that would otherwise generate dust from the hard branch pole section, thereby transforming a harmful effect into a protective mechanism.
3Productivity
If the core member is passed through multiple rolls and plate members, then the productivity of assembly is improved, but the complexity of ensuring proper fit and preventing disassembly increases
Solution Approach 1:
The invention makes the lateral plates multi-functional: they provide structural support as plate members, prevent disassembly through protruding sections, and guide the core member during assembly. This universality reduces the need for separate components for each function, simplifying the overall assembly structure while maintaining the ability to pass the core through multiple rolls efficiently.
Data Source
AI summary
According to the present invention, a core member hardly falls off from a lateral plate for protecting an end surface of a roll, and abrasion dust is less likely to be generated. The core member having a length L3 is passed through four rolls each of which is obtained by winding a separator on a core and has a width L1 and five buffering materials each of which has a thickness L2, a protruding section which is included in a protector and has a height L4 is inserted into the core member, and L4>4L1+5L2−L3>0 holds true.