Pouch Cell Formation and Gas Pocket Hole Sealing
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Solution Overview
Problem
Existing formation processes for pouch-type battery cells face challenges in efficiently discharging generated gas without discharging electrolyte, leading to potential contamination and safety hazards, and require complex and time-consuming sequential hole formation.
Innovation Solution
A formation device with a charging part, loading buffer, unloading buffer, hole processing part, and sealing part that facilitates partial charging to expand the gas pocket, forms a discharge hole, and seals it to prevent electrolyte discharge, using movable units to process multiple cells simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional battery formation device is used, then the formation process can be completed, but the batteries are charged at different rates due to position differences, reducing productivity and requiring frequent disassembly for sorting
Solution Approach 1:
The patent applies local quality by providing different anode voltages to different groups of battery cells based on their position in the stack. Specifically, batteries in different vertical positions (first position vs second position) receive different anode voltages from the power supply device, compensating for the positional differences that would otherwise cause different charge rates. This localized adjustment ensures uniform formation across all batteries while maintaining high productivity.
2Productivity
If batteries are charged at different rates, then formation can proceed in parallel, but sorting and reassembly are frequently required, increasing device complexity and time loss
Solution Approach 1:
The patent applies universality by designing a power supply device that can simultaneously provide different anode voltages to multiple groups of batteries through a unified system. The power supply device integrates multiple output channels that can be independently controlled, allowing it to serve multiple functions: charging batteries at different positions with different voltage requirements while maintaining them all in the same formation device without requiring separate sorting and reassembly operations.
3Manufacturing precision
If different anode voltages are applied to batteries at different positions, then charge rate consistency is improved, but the power supply device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the battery stack into different position groups (first position and second position) and assigning different anode voltages to each group. The power supply device is segmented into multiple output channels, with each channel dedicated to a specific position group. This segmentation allows independent control of voltages for different positions while maintaining an organized and manageable device structure.
Data Source
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AI summary
Disclosed herein includes: a charging part for charging a battery cell; a loading buffer part where a battery cell waits before being placed in the charging part; an unloading buffer part in which a battery cell that has been charged and removed from the charging part waits; a hole processing part forming a discharge hole in a gas pocket part of the battery cell; and a sealing part that seals the discharge hole of the battery cell.