Battery Insulating Sheet Layout for Electrolyte Flow and Insulation
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Solution Overview
Problem
The formation of a short-circuit path due to water entry in batteries can cause partial discharge between the electrode assembly and the exterior package, leading to dielectric breakdown.
Innovation Solution
A battery design featuring an insulating sheet with specific folded portions that create a communication path for electrolyte solution, positioned to minimize direct contact between the electrode assembly and the exterior package, thereby reducing the risk of partial discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating sheet is disposed between the electrode assembly and the exterior package to prevent partial discharge, then the insulation performance is improved, but the electrolyte solution may not reach the electrode assembly properly
Solution Approach 1:
The insulating sheet is divided into a body portion and multiple protruding portions that extend toward the electrode assembly. This segmentation allows the insulating sheet to maintain electrical insulation while creating channels for electrolyte solution to reach the electrode assembly, resolving the contradiction between insulation performance and electrolyte distribution.
Solution Approach 2:
The protruding portions of the insulating sheet act as intermediaries that bridge the gap between the exterior package and the electrode assembly. These protrusions allow electrolyte solution to pass through the insulating structure and reach the electrode assembly, while the insulating sheet itself maintains the electrical insulation barrier.
2Reliability
If the insulating sheet completely covers the electrode assembly to prevent short-circuit, then the insulation performance is improved, but the communication path for electrolyte solution is blocked
Solution Approach 1:
The insulating sheet is segmented with protruding portions that create controlled openings. This segmentation allows the sheet to provide comprehensive insulation coverage while simultaneously creating pathways for electrolyte solution to reach the electrode assembly, resolving the contradiction between short-circuit prevention and electrolyte flow.
Solution Approach 2:
Different portions of the insulating sheet have different functions: the body portion provides insulation, while the protruding portions create localized channels for electrolyte flow. This local differentiation allows the insulating sheet to simultaneously achieve both insulation and electrolyte distribution functions.
Data Source
AI summary
In an insulating sheet, a first left-side piece portion, a second left-side piece portion, a left-side bottom piece portion, a first left-side connection portion, and a second left-side connection portion form a first communication path for communicating inside and outside of the insulating sheet, the first communication path having a first open end at a position of an end of each of the first left-side connection portion and the second left-side connection portion on the opening side of an exterior package. The first communication path is located on a shortest reach path for an electrolyte solution reaching, from the outside of the insulating sheet, an end portion of an electrode assembly closest to a ridgeline portion of the exterior package on the bottom portion side and on the side of one of a pair of second side walls.