Secondary Battery Insulating Tape Alignment for Structural Integrity
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Solution Overview
Problem
Secondary batteries experience disconnection and ignition due to stepped portions between electrodes and insulating tapes, which compromise the insulating properties and structural integrity.
Innovation Solution
The implementation of internal and external insulating tapes with specific attachment points and overlapping configurations to eliminate stepped portions between electrodes and tapes, enhancing both insulating properties and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating tape is attached to electrodes to improve insulating property, then insulating property is improved, but stepped portion occurs between electrode and insulating tape causing disconnection and ignition
Solution Approach 1:
The insulating structure is segmented into multiple separate insulating tapes attached at different positions around the electrode assembly. Each insulating tape is attached independently at specific locations (first, second, third, and fourth positions) rather than using a single continuous tape, which prevents the formation of stepped portions while maintaining comprehensive insulation coverage.
Solution Approach 2:
Multiple insulating tapes are combined to form a complete insulating system. The insulating tapes are positioned at different locations around the electrode assembly and work together to provide comprehensive insulation, eliminating the need for a single large insulating tape that would create stepped portions with the electrode.
2Device complexity
If single insulating tape is used to simplify structure, then device complexity is reduced, but stepped portion causes disconnection and ignition
Solution Approach 1:
The insulating structure is divided into multiple separate insulating tapes positioned at different locations around the electrode assembly. This segmentation approach maintains structural integrity by eliminating stepped portions while keeping each individual tape component simple and easy to attach.
3Object-affected harmful factors
If insulating tape ends are aligned with electrode ends to remove stepped portion, then disconnection and ignition are prevented, but attachment precision requirement increases
Solution Approach 1:
Instead of requiring precise alignment of insulating tape ends with electrode ends throughout, the solution applies insulation locally at specific critical positions (first, second, third, and fourth positions) around the electrode assembly. This local quality approach prevents stepped portions at critical locations without requiring high-precision alignment across the entire electrode length.
Solution Approach 2:
The insulating tapes extend beyond the minimum necessary coverage to ensure that no stepped portions occur at any critical position. The tapes are positioned and sized to provide excessive coverage that guarantees prevention of disconnection and ignition without requiring precise alignment.
Data Source
AI summary
The present invention relates to a secondary battery including: an electrode assembly in which a plurality of electrodes and a plurality of separators are alternately stacked to each other and wound; an internal insulating tape attached to an inner surface of the electrode, wherein an attachment starting point (a) and an attachment ending point (b) are disposed in a line (A) that is directed to a winding center of the electrode assembly, and the internal insulating tape surrounds a central portion of the electrode assembly once; and an external insulating tape attached to an outer surface of the electrode corresponding to the internal insulating tape, wherein an attachment starting point (c) and an attachment ending point (d) are disposed in a line (B) that is directed to the winding center of the electrode assembly, and the external insulating tape surrounds the central portion of the electrode assembly once.