Roll Electrode Axial Restraint for Thermal Expansion Mismatch
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Solution Overview
Problem
Roll electrodes experience winding deviation due to thermal expansion differences between the core and the electrode, leading to gaps and axial movement issues during transportation after heat treatment.
Innovation Solution
A roll electrode design that includes a core with a higher thermal expansion coefficient than the electrode, featuring a fixing part for the winding-start end and a tape member or ring plates to regulate the axial movement of the electrode, thereby preventing winding deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the core has a higher thermal expansion coefficient than the electrode, then the core can accommodate thermal expansion during heat treatment, but winding deviation occurs during transportation after heat treatment due to gap formation between core and electrode
Solution Approach 1:
The patent applies preliminary action by fixing the intermediate portion of the electrode to the core before transportation and subsequent processes. The tape member is attached in advance to prevent winding deviation during transportation, addressing the problem before it occurs. This preliminary fixing ensures that even though gaps form due to thermal expansion differences, the electrode maintains its axial position relative to the core.
Solution Approach 2:
The tape member acts as an intermediary element between the core and the electrode. It mediates the relationship between these two components by providing a fixing mechanism that compensates for the gap formation caused by differential thermal expansion. The tape member transfers and distributes the fixing force along the intermediate portion of the electrode, preventing axial displacement while allowing the core and electrode to expand differently during heat treatment.
2Ease of manufacture
If only the winding-start end portion is fixed to the core, then the electrode can be securely anchored at the start, but winding deviation still occurs during transportation after heat treatment
Solution Approach 1:
The patent applies segmentation by dividing the fixing function into two distinct parts: the winding-start end portion fixed to the core and the intermediate portion also fixed to the core using a tape member. This segmentation allows each fixing point to serve a specific purpose - the start end provides anchoring while the intermediate portion prevents axial displacement during transportation. By segmenting the fixing mechanism, the patent achieves both ease of manufacture and prevention of winding deviation.
3Temperature
If gaps form between the core and electrode after heat treatment, then thermal expansion is accommodated, but axial movement and winding deviation occur during transportation
Solution Approach 1:
The patent applies preliminary action by fixing the intermediate portion of the electrode to the core before transportation and subsequent processes. The tape member is attached in advance to prevent winding deviation during transportation, addressing the problem before it occurs. This preliminary fixing ensures that even though gaps form due to thermal expansion differences, the electrode maintains its axial position relative to the core.
Solution Approach 2:
The tape member acts as an intermediary element between the core and the electrode. It mediates the relationship between these two components by providing a fixing mechanism that compensates for the gap formation caused by differential thermal expansion. The tape member transfers and distributes the fixing force along the intermediate portion of the electrode, preventing axial displacement while allowing the core and electrode to expand differently during heat treatment.
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 proposed solution effectively suppresses winding deviation by enhancing the fixing force between the electrode and the core, ensuring stable axial alignment even after heat treatment and during transportation.
Implementation Method 1
the expansion coefficient of the core that configures the roll electrode is higher than the expansion coefficient of the electrode
Data Source
Figure 1~2
Figure 3~4
Figure 5(A)~5(B)
AI summary
[Problem] To provide a means capable of suppressing the generation of winding deviation in a roll electrode in which the expansion coefficient of a core is higher than the expansion coefficient of an electrode. [Solution] The roll electrode comprises a core 10 that extends in the axial direction and has an outer circumference that is substantially circular; an electrode 20 that has an expansion coefficient lower than that of the core and is wound into a roll shape on the outer circumference of the core; a fixing part 30 for fixing an end portion 21 from which the electrode starts being wound around the core; and a regulating part 40 for regulating the axial movement of the electrode wound into the roll shape with respect to the core.