Electrode Sheet Lamination With Inclined Separator Alignment
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Solution Overview
Problem
The existing manufacturing methods for electrode bodies, such as those used in lithium-ion secondary batteries, face issues with productivity improvements leading to positional deviations and subsequent breakage of electrodes during the winding process.
Innovation Solution
A manufacturing method involving an electrode sheet with first and second electrodes alternately laminated via a separator, where the separator's side surface is inclined from the vertical direction, ensuring proper alignment and preventing cumulative positional deviations, and a manufacturing apparatus with a storage member featuring a wall portion inclined from the vertical direction to support this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the winding speed is raised to improve productivity, then productivity is improved, but the electrodes may break under the accumulated influences of positional deviation
Solution Approach 1:
The separator is designed with an inclined side surface before the winding process begins. This preliminary structural feature prevents positional deviation from accumulating during winding, thereby preventing electrode breakage even when winding speed is increased to improve productivity
Solution Approach 2:
The separator employs an asymmetric structure where one side surface is inclined relative to the winding direction. This asymmetric design creates a self-aligning effect that compensates for positional deviations during high-speed winding, resolving the contradiction between productivity and electrode integrity
2Productivity
If the winding speed is raised to improve productivity, then productivity is improved, but positional deviation occurs cumulatively
Solution Approach 1:
The separator is pre-configured with an inclined side surface that actively corrects positional deviations during the winding process. This preliminary structural feature ensures that even at high winding speeds, positional accuracy is maintained by preventing cumulative deviations
Solution Approach 2:
The inclined side surface of the separator provides continuous geometric feedback during winding. As electrodes are wound, the inclined surface naturally guides and realigns them, creating a self-correcting mechanism that maintains positioning precision throughout the winding process
Data Source
AI summary
This disclosure achieves the object by providing a manufacturing method for an electrode body, the manufacturing method including: a preparing step of preparing an electrode sheet including one separator, a plurality of first electrodes placed on a first surface of the separator, and a plurality of second electrodes placed on a second surface opposite from the first surface of the separator; and a laminating step of laminating the first electrodes and the second electrodes in the electrode sheet alternately via the separator. The electrode sheet satisfies predetermined conditions (i) to (iii) in a plan view in the thickness direction of the electrode sheet. In the laminating step, the first electrodes and the second electrodes are laminated alternately via the separator while the separator placed on a side surface of each of the first electrodes is brought into contact with a wall portion inclined from the vertical direction.