Lithium-Ion Cell Formation with Pulsating Compression Wetting
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Solution Overview
Problem
The manufacturing process of lithium-ion batteries is lengthy and costly, primarily due to the time-consuming soaking process required for electrolyte wetting, which can lead to uneven wetting and reduced battery efficiency, and the challenges of controlling vacuum application for efficient electrolyte infiltration.
Innovation Solution
A method that eliminates or reduces the soaking step by applying pulsating compression to lithium-ion battery cells immediately after sealing, allowing for simultaneous formation charging and electrolyte wetting without the need for vacuum, ensuring consistent and efficient electrolyte penetration across all components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a soaking process is used for electrolyte wetting, then electrolyte penetration is achieved, but manufacturing time is significantly increased
Solution Approach 1:
The patent applies periodic compression cycles during the formation charging process, where compression force is applied and released in repeated cycles. This periodic mechanical action accelerates electrolyte penetration into the electrode components, replacing the need for lengthy soaking processes while ensuring uniform wetting throughout the battery cell.
Solution Approach 2:
The patent transitions from a static soaking process to a dynamic compression process. By applying time-varying compression forces during formation charging, the system actively promotes electrolyte distribution through mechanical deformation and relaxation of the electrode structure, significantly reducing the time required for complete wetting.
2Manufacturing precision
If vacuum application is used for electrolyte infiltration, then electrolyte penetration is improved, but process complexity and control difficulty increase
Solution Approach 1:
The patent removes the vacuum application step from the manufacturing process entirely. Instead of using vacuum to facilitate electrolyte infiltration, the invention relies on natural capillary action enhanced by periodic compression during formation charging, thereby eliminating the need for complex vacuum control systems while maintaining effective electrolyte distribution.
3Reliability
If a lengthy manufacturing process is used, then battery formation is thorough, but production cost increases
Solution Approach 1:
The patent performs electrolyte wetting and formation charging simultaneously in a continuous process. By applying periodic compression during the formation charging phase, the system achieves thorough battery formation without requiring separate soaking steps, thereby reducing total process time and production costs while maintaining formation quality.
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
This approach significantly reduces manufacturing time, maintains electrolyte quality, and enhances battery performance by ensuring uniform wetting, leading to higher efficiency and reduced production costs, while also simplifying the process for stacking multiple cells.
Implementation Method 1
applying pulsating compression comprising alternating a first time period of applying a first compression force greater than zero and a second time period of applying a second compression force lower than the first compression force
Implementation Method 2
wet the individual components of the cell during the formation charging
Data Source
AI summary
A method of producing a lithium-ion battery includes filling at least one cell of the battery with an electrolyte followed directly with a first step of sealing the at least one cell and a second step of applying pulsating compression to the at least one cell during formation charging, the pulsating compression comprising alternating a first time period of applying a first compression force F1 greater than zero and a second time period of applying a second compression force F2, wherein F1>F2, and the formation charging includes a first charge of the battery.