Stepped Battery Cell Top Cover Sealing for Electrolyte Injection
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Solution Overview
Problem
Residual electrolyte at the electrolyte injection hole after injection affects the quality of lithium battery cells due to poor airtightness between the electrolyte injection nozzle and the electrolyte injection hole, leading to electrolyte leakage and contamination.
Innovation Solution
A battery cell top cover with a stepped electrolyte injection hole and an electrolyte injection nozzle with a protruding portion and corresponding pressing surfaces, ensuring surface-to-surface abutting for effective sealing, preventing leakage, and reducing frictional forces to prolong service life and reduce production and maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple electrolyte injection hole structure is used, then the manufacturing process is simple, but the airtightness between the electrolyte injection nozzle and the electrolyte injection hole is poor, leading to electrolyte leakage
Solution Approach 1:
The electrolyte injection hole is divided into three distinct sections (first, second, and third hole sections) with different diameters, creating a stepped structure. This segmentation allows each section to serve a specific function: the first section receives the electrolyte, the second section provides a sealing surface with the nozzle, and the third section allows excess electrolyte to drain. This segmented design improves airtightness while maintaining manufacturing feasibility through standard machining operations.
Solution Approach 2:
The invention transitions from a simple through-hole structure to a multi-dimensional stepped structure by creating different diameter sections along the length of the injection hole. This dimensional change introduces a sealing surface (the stepped surface between second and third hole sections) that enables effective contact and sealing with the electrolyte injection nozzle, thereby improving airtightness without significantly complicating the manufacturing process.
2Reliability
If a tight seal is achieved between the electrolyte injection nozzle and the electrolyte injection hole, then electrolyte leakage is prevented, but frictional force increases, reducing service life
Solution Approach 1:
The stepped surface between the second and third hole sections provides a sealing surface that is larger than the minimum required for sealing. This excessive sealing area ensures reliable sealing even with minor misalignments or surface irregularities, while the stepped geometry distributes the contact pressure, reducing localized friction and wear on the moving electrolyte injection nozzle, thereby extending service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves reliable surface sealing, preventing electrolyte contamination and leakage, thereby enhancing battery performance and reducing costs by ensuring effective sealing during electrolyte injection.
Implementation Method 1
the first pressing surface is configured to abut against a second pressing surface... implements surface sealing with a large contact area through surface-to-surface abutting
Implementation Method 2
the electrolyte injection hole is configured to communicate with an electrolyte injection channel, so as to inject an electrolyte into the battery cell
Data Source
AI summary
This application discloses a battery cell top cover, a battery cell, a battery, an electric device, and an electrolyte injection nozzle. The battery cell top cover includes a top cover body. The top cover body is provided with an electrolyte injection hole. The electrolyte injection hole includes a first hole section, a second hole section, and a third hole section that are sequentially arranged and communicate with each other in a thickness direction of the top cover body. A first pressing surface is formed between an end of the second hole section facing away from the first hole section and the third hole section. The first pressing surface can abut against a second pressing surface of the electrolyte injection nozzle to implement surface sealing.