Battery Cell Activation Pressing for Gas Release and Electrolyte Retention
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Solution Overview
Problem
Existing methods struggle to efficiently discharge gas trapped between electrodes and separators in battery cells while minimizing electrolyte solution discharge during the degassing process.
Innovation Solution
A two-step pressing method is employed, where the second pressing applies lower pressure than the first, combined with a vacuum treatment to widen the electrode-separator interface and facilitate gas discharge, while preventing excessive electrolyte loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a formation cycle is performed to activate lithium ions in the anode before charging, then lithium ion insertion is improved, but processing time and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-coating the anode with a porous coating layer containing lithium ions during the electrode manufacturing process, before the battery cell is assembled and activated. This preliminary preparation eliminates the need for a separate formation cycle to introduce lithium ions, as they are already present in the anode structure ready for immediate insertion during normal charging operations.
2Reliability
If a formation cycle is performed to activate lithium ions in the anode before charging, then lithium ion insertion is improved, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-coating the anode with a porous coating layer containing lithium ions during the electrode manufacturing process, before the battery cell is assembled and activated. This preliminary preparation eliminates the need for a separate formation cycle to introduce lithium ions, as they are already present in the anode structure ready for immediate insertion during normal charging operations.
3Manufacturing precision
If excess electrolyte is removed by centrifugal force, then electrolyte distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the battery cell's own rotational motion during assembly or transport to generate centrifugal force that distributes electrolyte uniformly. The electrolyte naturally migrates from regions of high concentration to low concentration under the centrifugal field, eliminating the need for external centrifugal processing equipment or complex manufacturing steps.
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
Effectively discharges trapped gas and minimizes electrolyte loss, enhancing the efficiency and quality of battery cell activation.
Implementation Method 1
a porous coating layer which has adsorbed lithium ions
Implementation Method 2
method for activating a battery cell and battery cell manufacturing method
Data Source
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AI summary
The present invention relates a method of activating a battery cell and a method of manufacturing a battery cell including the same, and more particularly, to a battery cell activation method capable of easily discharging gas trapped between a separator and an electrode inside an electrode assembly of a battery cell, and preventing discharge of a large amount of electrolyte solution during a gas discharging process, and a method of manufacturing a battery cell including the same.