Battery Cell Filling Structure for Electrolyte Overflow Buffering
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Solution Overview
Problem
Battery cells face issues with electrolyte overflow during manufacturing, handling, and use, leading to contamination and reduced reliability and manufacturability, as well as pressure-related reliability problems due to gas generation.
Innovation Solution
The battery cell design incorporates a protruding structure with a liquid filling hole that extends beyond the housing wall, creating an additional accommodating space to buffer electrolyte overflow and gas, while allowing for increased electrolyte injection volume and reducing current-carrying resistance by integrating the filling hole into a post structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid filling hole is formed in the housing wall, then the electrolyte can be filled into the battery cell, but the electrolyte may overflow and contaminate the housing wall and parts during manufacturing, handling, or use
Solution Approach 1:
The liquid filling hole is extended in the vertical dimension by making the protruding structure protrude from the outer surface of the housing wall. This dimensional extension creates additional buffer space within the hole structure itself, preventing electrolyte overflow during filling and handling operations.
Solution Approach 2:
The protruding structure with its extended liquid filling hole creates a buffer zone before the electrolyte can reach the housing wall surface. This beforehand cushioning structure captures any potential overflow, preventing contamination of the housing wall and surrounding parts.
2Duration of action of moving object
If the liquid filling hole is extended to increase electrolyte injection amount, then the cycle life is prolonged, but the structural complexity increases
Solution Approach 1:
The protruding structure that extends the liquid filling hole is integrated with the housing wall as a unified component. This merging approach allows the structure to serve multiple functions: providing structural support, creating the extended filling hole, and preventing overflow, thereby reducing overall device complexity despite the extended functionality.
Solution Approach 2:
The protruding structure performs multiple functions simultaneously: it extends the liquid filling hole to increase electrolyte injection volume, prevents electrolyte overflow, and maintains structural integrity of the housing wall. This multi-functionality reduces the need for additional separate components.
3Reliability
If the protruding structure is added to extend the liquid filling hole, then the electrolyte overflow is reduced, but the manufacturing complexity increases
Solution Approach 1:
The protruding structure is integrated with the housing wall in such a way that it can be manufactured as a single piece or pre-assembled unit, reducing the number of separate manufacturing steps and assemblies required.
4Quantity of substance
If the liquid filling hole height is increased, then the total electrolyte injection amount is increased, but the gas pressure buffering capability is reduced
Solution Approach 1:
The protruding structure is divided into multiple segments or sections along its length. This segmentation allows different portions of the structure to serve different functions: lower sections provide electrolyte buffer space, while upper sections or specific regions provide gas pressure relief and buffering capabilities.
Solution Approach 2:
Different regions of the protruding structure are designed with different properties or features. For example, certain sections may have larger cross-sectional areas for electrolyte storage, while other sections have specific geometries or materials optimized for gas pressure buffering and release.
Data Source
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AI summary
A battery cell, a battery, and an electric device are provided, and relate to the field of battery technologies. The battery cell includes a housing and a protruding structure, where the housing defines an accommodating cavity and includes a first housing wall, the protruding structure is disposed on the first housing wall and at least partially protrudes to a side of an outer surface of the first housing wall away from the accommodating cavity, a liquid filling hole is formed in the protruding structure, two ends of the liquid filling hole are an outer hole end and an inner hole end, respectively, which are sequentially disposed along a direction from the outer surface to an inner surface of the first housing wall, and the inner hole end is located on a side of the inner surface of the first housing wall away from the accommodating cavity.