Secondary Battery Pre-Degassing With Heated Case Pressing
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Solution Overview
Problem
Existing secondary battery manufacturing processes fail to effectively remove internal gas during the degassing process, leading to increased electrolyte discharge and potential cycle deterioration due to high gas generation and inadequate vacuum conditions.
Innovation Solution
A pre-degassing process is introduced, involving primary charging, pressing the battery case with heat application to discharge internal gas outside the electrode assembly, followed by secondary aging to impregnate the electrolyte, reducing the non-reaction area and preventing electrolyte discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of electrolyte additives and loading amount are increased to improve battery capacity and cycle characteristics, then the battery capacity and cycle are improved, but the amount of gas generated during primary charging increases
Solution Approach 1:
A pre-degassing process is performed before the main degassing operation to remove gas generated during primary charging. This preliminary action prevents gas accumulation that would otherwise interfere with subsequent degassing and electrolyte distribution, allowing the use of higher electrolyte additives without compromising the degassing effect.
Solution Approach 2:
The degassing process is divided into two distinct stages: pre-degassing (before main electrolyte distribution) and main degassing (after electrolyte distribution). This segmentation allows each stage to address specific gas removal needs, effectively managing the increased gas volume resulting from higher electrolyte additive amounts.
2Quantity of substance
If the degree of vacuum, time, or pusher pressure is increased to remove gas effectively, then gas removal is improved, but electrolyte discharge and cycle deterioration increase
Solution Approach 1:
The pre-degassing process removes a significant portion of gas before main electrolyte distribution occurs. This preliminary gas removal reduces the subsequent need for aggressive vacuum or high pusher pressure during main degassing, thereby preventing electrolyte discharge and cycle deterioration while maintaining effective gas removal.
Solution Approach 2:
The two-stage degassing process ensures continuous gas removal throughout the manufacturing sequence. By removing gas in both the pre-degassing and main degassing stages, the process maintains effective gas elimination without requiring excessive vacuum or pressure at any single stage, thus avoiding electrolyte loss.
3Quantity of substance
If a pre-degassing process is added to remove internal gas, then gas removal is improved, but the manufacturing process complexity increases
Solution Approach 1:
The pre-degassing process is integrated with the existing manufacturing sequence by positioning it between primary charging and electrolyte distribution. This merging approach incorporates the additional gas removal step without requiring completely separate equipment or processes, thereby limiting the increase in manufacturing complexity while achieving improved internal gas removal.
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 pre-degassing process significantly reduces electrolyte discharge and non-reaction areas, enhancing battery capacity and preventing cycle deterioration by effectively removing internal gas without increasing electrolyte volume.
Implementation Method 1
pressing the battery case with heat application to discharge internal gas
Implementation Method 2
pressing the battery case to discharge a gas inside the electrode assembly
Implementation Method 3
elapsing a predetermined time so that the electrode assembly is impregnated into the electrolyte
Data Source
AI summary
A method for manufacturing a secondary battery and a pre-degassing device for manufacturing a secondary battery are disclosed. The method comprises: an accommodation process of accommodating an electrode assembly in an accommodation part formed inside a battery case to form a cell; an electrolyte injection process of injecting an electrolyte into the accommodation part of the battery case; a primary aging process of elapsing a predetermined time so that the electrode assembly is impregnated into the electrolyte; a primary charging process of primarily charging and discharging the cell; a pre-degassing process of pressing the battery case to discharge a gas inside the electrode assembly to the outside of the electrode assembly; and a secondary aging process of elapsing a predetermined time so that the electrode assembly is impregnated into the electrolyte, wherein, in the pre-degassing process, the battery case is pressed while applying heat to the battery case.