Electrode Tab Joint Compression With Air-Suction Contamination Control
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Solution Overview
Problem
Conventional methods for compressing the joint of an electrode tab and an electrode lead in lithium secondary batteries fail to effectively prevent contamination of the electrode assembly by foreign matters during the compression process.
Innovation Solution
An apparatus comprising an upper and lower pressing unit, a driving unit, and a foreign matter suction unit with air injection nozzles that inject air obliquely to the joining surface of the electrode tab and electrode lead, controlled to operate only during non-compressed positions to prevent foreign matter contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If compression process is performed on electrode tab and electrode lead joint, then joint strength is improved, but foreign matter contamination of electrode assembly body increases
Solution Approach 1:
The patent extracts and removes foreign matters from the compression area using a suction device with suction holes positioned at the compression roller. This separates the harmful foreign matter removal function from the compression function, allowing both joint strength improvement and contamination prevention to be achieved simultaneously.
Solution Approach 2:
The patent introduces air as an intermediary substance to blow foreign matters away from the electrode assembly body during compression. The air flow acts as a mediator that carries foreign particles away from the sensitive areas, preventing contamination while maintaining effective compression.
2Object-affected harmful factors
If air injection is performed to remove foreign matters, then contamination prevention is improved, but foreign matters may be blown into electrode assembly body
Solution Approach 1:
The patent uses a sensor to detect the presence and position of foreign matters, and based on this feedback information, controls the air injection timing and suction operation. This closed-loop control ensures air is injected at optimal moments to remove foreign matter without blowing it into the electrode assembly body.
Solution Approach 2:
The patent employs a dual pneumatic system with both air injection nozzles and suction devices. The coordinated use of pressurized air for removal and vacuum suction for capture creates a controlled pneumatic environment that prevents foreign matter dispersion while effectively preventing contamination.
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 apparatus significantly reduces contamination of the electrode assembly by effectively removing foreign matters through controlled air injection and suction, enhancing the anti-contamination effect during the compression process.
Implementation Method 1
the upper support member includes an air injection nozzle that injects air obliquely from an outside of the upper compressing member toward a joining surface of the fed electrode tab and electrode lead
Implementation Method 2
a foreign matter suction unit, wherein the upper pressing unit includes an upper compressing member protruding downward and an upper support member in which the upper compressing member is fixed to a lower portion
Data Source
AI summary
An apparatus for compressing a joint between an electrode tab extending from an electrode assembly and electrode lead includes an upper pressing unit, a lower pressing unit, a suction unit, and a driving unit for moving the upper and lower pressing units up and down. The apparatus includes an air injection nozzle that injects air obliquely from an exterior region of an upper compressing member toward the joining surface of the electrode tab and electrode lead.