Electrode Plate Compression Line With Tension Relief
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Solution Overview
Problem
The existing manufacturing methods for electrode plates in lithium ion secondary batteries often result in variations in length between the applied and non-applied portions, leading to wrinkles and potential breakage during compression.
Innovation Solution
A manufacturing apparatus and method that includes a conveyance line with a compression roll and a tension reducing mechanism provided upstream or downstream of the compression roll, which reduces the tension applied to the electrode plate, thereby stabilizing the manufacturing process and preventing breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the applied portion is compressed by roll pressing to increase electrode active material density and uniformity, then the density and thickness uniformity are improved, but the base material is also rolled causing length variation between applied and non-applied portions which generates wrinkles and hinders conveyance or winding
Solution Approach 1:
The patent applies different treatments to different portions of the electrode plate: the applied portion undergoes compression while the non-applied portion is heated to relax strain. This segmentation of treatment methods resolves the contradiction by allowing each portion to be optimized independently - the applied portion achieves density and thickness uniformity through compression, while the non-applied portion maintains its length through thermal strain relaxation.
Solution Approach 2:
The patent changes the physical state parameters of different portions: compression is applied to the applied portion to increase density, while heating is applied to the non-applied portion to relax strain and prevent length variation. These parameter changes (mechanical compression vs. thermal treatment) resolve the contradiction by addressing the specific needs of each portion.
2Shape
If a treatment for eliminating variations in length between applied and non-applied portions is provided in the conveyance line, then length uniformity is improved, but the electrode plate is more likely to be broken at the time of compression of the applied portion
Solution Approach 1:
The patent applies heating to the non-applied portion before compression of the applied portion to pre-relax the strain and eliminate length variations. This preliminary action prevents the formation of wrinkles and reduces the risk of breakage during subsequent compression by preparing the electrode plate in advance.
Solution Approach 2:
The patent utilizes thermal energy to induce phase changes or molecular rearrangements in the non-applied portion, heating it to relax strain. This thermal treatment changes the physical state of the base material temporarily, allowing strain relaxation without causing breakage during the subsequent compression process.
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 reduces the tension applied to the electrode plate, preventing excessive stretching and breakage of the base material during compression, thus ensuring more stable and reliable manufacturing of electrode plates.
Implementation Method 1
a tension reducing mechanism provided in at least one of an upstream section ending at the compression roll or a downstream section starting at the compression roll in the conveyance line and reducing a tension applied to the electrode plate
Data Source
AI summary
A manufacturing apparatus for an electrode plate includes: a conveyance line of the electrode plate having an applied portion in which an electrode active material is applied to a surface of a base material and a non-applied portion in which the electrode active material is not applied to the surface of the base material; a compression roll provided in the conveyance line and compressing the applied portion; and a tension reducing mechanism provided in at least one of an upstream section ending at the compression roll or a downstream section starting at the compression roll in the conveyance line and reducing a tension applied to the electrode plate.