Wound Electrode Assembly With Ceramic Tape-Bonding Layer
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Solution Overview
Problem
Wound-type secondary batteries face a risk of damage and potential ignition, rupture, or explosion due to external impacts, as the finishing tape used to secure the ends can separate, leaving the electrode assembly unprotected.
Innovation Solution
The electrode assembly incorporates a first electrode with a substrate, an active material layer, a first functional layer made of ceramic material, and a finishing tape attached to the upper surface of the first functional layer. This configuration enhances the adherence of the finishing tape and reduces the likelihood of separation upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a finishing tape is attached to the end of a wound-type electrode assembly, then the electrode assembly is protected and secured, but the finishing tape may separate due to impact, leaving the electrode assembly vulnerable to damage
Solution Approach 1:
The finishing tape is divided into multiple segments (first finishing tape and second finishing tape) that are attached to different portions of the electrode assembly. This segmentation allows each tape segment to independently adhere to the electrode assembly, distributing the impact forces and preventing complete separation. The first finishing tape is attached to the first electrode and the second finishing tape is attached to the second electrode, creating redundant protection against tape separation.
Solution Approach 2:
The finishing tapes are pre-attached to the electrode assembly during the manufacturing process before the battery is put into service. This preliminary action ensures that the tapes are already in place to provide protection against impact from the beginning, rather than requiring post-assembly attachment. The tapes are positioned and adhered to specific portions of the electrode assembly during winding and assembly operations.
2Area of stationary object
If the finishing tape is made wider to cover more surface area, then protection is improved, but the complexity of attachment and alignment increases
Solution Approach 1:
Instead of using a single wide finishing tape that would be difficult to align and attach, the tape is segmented into multiple narrower tapes (first and second finishing tapes) of widths of 3 mm to 7 mm. Each segment is attached to a specific portion of the electrode assembly, making the attachment process simpler and more reliable. The segmented approach distributes the attachment points, reducing the complexity of aligning a single wide tape while achieving comparable or superior coverage.
Solution Approach 2:
The finishing tapes are attached to specific local portions of the electrode assembly rather than attempting to cover the entire surface with a single tape. The first finishing tape is attached to a first portion and the second finishing tape is attached to a second portion, allowing each tape to be optimally positioned and adhered to its designated area. This local attachment approach reduces alignment complexity while providing distributed protection across the electrode assembly.
Data Source
AI summary
A wound-type electrode assembly including a first electrode, a separator, and a second electrode, where the first electrode may include a substrate, an active material layer on at least one surface of the substrate, a first functional layer spaced apart from the active material layer by a predetermined distance and on the substrate, a finishing tape attached to an upper surface of the first functional layer, one surface of the substrate exposed between the active material layer and the first functional layer, and an upper surface of the active material layer.