Battery Cell Isolation Structure for Powder Migration Blocking
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Solution Overview
Problem
The issue of short circuits and corrosion in battery cells due to powder from the electrode assembly moving through holes in the separation structure to the shell, causing contact and potential damage.
Innovation Solution
A battery cell design with a separation structure featuring through holes covered by insulating sheets, which reduces the movement of powder from the electrode assembly to the shell, enhancing the cell's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through holes are provided in the separation structure, then the separation structure allows for assembly and structural integrity, but powder from the electrode assembly can move through the holes to the shell causing short circuit or corrosion
Solution Approach 1:
An insulating sheet is introduced as an intermediary component between the separation structure and the electrode assembly. The insulating sheet covers the through holes to prevent powder from reaching the shell, while still allowing the separation structure to perform its assembly and structural functions. This mediator eliminates the harmful powder movement without compromising the structural integrity provided by the through holes.
Solution Approach 2:
The solution segments the separation structure into two functional parts: the main separation structure that provides structural support and assembly features (including through holes), and the insulating sheet that specifically addresses the powder prevention function. This segmentation allows each component to be optimized for its specific function while working together to solve the overall problem.
2Object-affected harmful factors
If insulating sheets are added to cover the through holes, then powder movement is prevented, but the device complexity increases
Solution Approach 1:
The insulating sheet is implemented as a thin film component that can be easily manufactured and integrated into the existing battery cell structure. This thin film approach prevents powder movement without adding significant structural complexity, as the sheet can be positioned and secured within the existing assembly space between the separation structure and electrode assembly.
Solution Approach 2:
The insulating sheet is designed as a simple, cost-effective component that can be easily manufactured and replaced if necessary. Its relatively simple construction and material requirements keep the added complexity and cost minimal while effectively preventing the harmful powder movement through the through holes.
Data Source
AI summary
A battery cell, a battery, and an electric device are disclosed. The battery cell includes a casing with an inner cavity and a first wall, an electrode assembly disposed in the inner cavity, an isolating structure at least partially positioned between the first wall and the electrode assembly, and an insulating piece. The isolating structure includes a first through hole, and the insulating piece includes a first portion that covers the first through hole. The structure reduces the likelihood of powder migrating from one side of the electrode assembly to the side of the first wall through the through hole, thereby improving the reliability of the battery cell.