Battery Electrode-Separator Winding to Prevent Wrinkles and S-Core
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Solution Overview
Problem
Current battery winding processes result in wrinkles and S-shaped cores due to inconsistent deformation of polymer separators and anode/cathode sheets, affecting battery performance and longevity.
Innovation Solution
A method where the separator is pre-bonded to the cathode or anode sheets to form sheet groups, ensuring equal deformation during winding, and a battery winding apparatus with multiple unwinding and winding mechanisms to improve efficiency and prevent wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tension is applied to material layers during winding to ensure straight material-layer line, then winding efficiency is improved, but separator deformation increases causing wrinkles and S-shaped cores
Solution Approach 1:
The patent merges the separator with the anode and/or cathode sheets to form an integrated sheet group. This combination ensures that all layers deform together during winding under tension, preventing differential deformation that causes wrinkles and S-shaped cores, while still allowing efficient winding operation
Solution Approach 2:
The separator is pre-bonded to the electrode sheets before the winding process. This preliminary action creates a unified structure that maintains consistent deformation characteristics during subsequent winding, eliminating the need to compromise between winding tension and sheet flatness
2Adaptability or versatility
If separator and electrode sheets are wound separately, then manufacturing flexibility is improved, but process complexity increases
Solution Approach 1:
The patent combines multiple material layers (separator and electrode sheets) into a single integrated sheet group that is wound together as one unit. This simplifies the winding process by eliminating the need for separate winding operations while maintaining the ability to control the structure through the bonding design
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 method ensures consistent deformation of sheets and separators, preventing wrinkles and S-shaped cores, enhancing battery performance and service life while simplifying the winding process.
Implementation Method 1
the separator or separators is pre-bonded to the cathode sheet and/or the anode sheet to form the first sheet group and the second sheet group
Data Source
AI summary
A battery winding apparatus and method is provided. The battery winding method includes steps of providing a first sheet group comprising a cathode sheet, a second sheet group comprising an anode sheet, and a winding mechanism for a winding operation, where the first sheet group and/or the second sheet group are pre-formed with a separator or separators; and winding the first sheet group and the second sheet group by the winding mechanism to obtain a battery cell. The battery winding method forms the first sheet group and the second sheet group by pre-bonding the separator or separators to the cathode sheet and/or the anode sheet to solve the problem of wrinkling of the sheet or changing the core into the S-shaped and low winding efficiency in the prior art.