Pouch Cell Formation Venting Without Electrolyte Discharge
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Solution Overview
Problem
The existing formation process for pouch-type battery cells faces challenges in efficiently discharging generated gas without discharging electrolyte, leading to potential contamination and safety hazards, and requires complex and time-consuming sequential hole formation.
Innovation Solution
A formation device with a charging part, loading and unloading buffer parts, and a hole processing part that forms discharge holes in the gas pocket part of battery cells, allowing partial charging to expand the gas pocket, forming discharge holes, and sealing them to discharge only internal gas without electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a discharge hole is formed in the gas pocket part of the battery cell to discharge the generated gas, then the gas can be discharged from the battery cell, but the electrolyte is discharged along with the gas due to increased internal pressure, causing contamination and safety accidents
Solution Approach 1:
The discharge system is segmented into multiple discharge holes distributed across the gas pocket part, rather than a single large discharge hole. This segmentation allows gas to escape through multiple smaller openings, reducing the internal pressure increase that would otherwise force electrolyte discharge. The segmented approach maintains the sealing integrity better while still achieving effective gas venting.
Solution Approach 2:
The discharge holes are pre-formed in the gas pocket part before the formation process begins. This preliminary action ensures that when gas is generated during charging, it can immediately escape through the pre-existing holes without causing pressure buildup that would lead to electrolyte discharge. The timing of hole formation before the harmful effect occurs prevents the contradiction from manifesting.
2Object-generated harmful factors
If a discharge hole is formed in each battery cell sequentially, then gas can be discharged from each cell, but the process becomes complicated and time-consuming
Solution Approach 1:
Multiple discharge hole formation operations are merged into a single simultaneous operation. The system forms discharge holes in multiple battery cells at the same time using a unified processing mechanism, rather than sequentially processing each cell individually. This merging dramatically improves productivity while maintaining the effectiveness of gas discharge from each cell.
Solution Approach 2:
The discharge hole formation mechanism is designed with universal applicability to handle multiple battery cells simultaneously. The same processing structure can form discharge holes in different cells at once, making the system multi-functional rather than single-purpose. This universality allows the system to maintain consistent discharge hole quality across all cells while improving overall process efficiency.
3Object-generated harmful factors
If the gas pocket part is overinflated to accommodate gas generation, then gas can be contained, but interference and collision with transfer means occur during removal, and excessive pouches are required
Solution Approach 1:
The harmful gas is extracted from the battery cell through discharge holes in the gas pocket part, rather than allowing the gas to accumulate and overinflate the pouch. By taking out the gas through controlled discharge openings, the system avoids the need for excessive pouch expansion, thereby preventing interference with transfer means and maintaining ease of operation during cell removal and handling.
Data Source
AI summary
An aspect of the current disclosure may include a formation device of a pouch-type battery cell. The formation device of a pouch-type battery cell may include a charging part configured to charge a battery cell, a loading buffer part, an unloading buffer part, a hole processing part configured to form a discharge hole in a gas pocket part of a battery cell, and a sealing part configured to seal the discharge hole of the battery cell. The battery cell waits on the loading buffer part before being placed into the charging part, and wherein the battery cell waits on the unloading buffer part after the battery cell has been charged and removed from the charging part.