Electrode Auto-Splicing with EPC Alignment to Prevent Gaps
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Solution Overview
Problem
The current auto-splicing process in secondary battery manufacturing faces issues such as overhang and meandering due to electrode gaps and position defects, which are difficult to correct, leading to degraded process capability and coating line dimension defects.
Innovation Solution
An auto-splicing device and method that aligns coating lines of electrodes using Edge Position Control (EPC) sensors facing the same direction to minimize gaps and correct meandering by sensing and aligning the same electrode surfaces during the splicing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EPC sensors are disposed to face different surfaces of running electrode and new electrode, then both electrodes can be sensed, but dimensional defects occur and process capability degrades
Solution Approach 1:
The patent applies asymmetry by configuring both EPC sensors to face the same direction (both facing the running electrode or both facing the new electrode) rather than symmetrically facing opposite surfaces. This asymmetric configuration allows both sensors to measure the same reference surface, enabling accurate detection of relative position differences and meandering between electrodes without causing dimensional defects in the coating line.
2Productivity
If auto splicing process is used to connect electrodes, then electrode supply continuity is improved, but meandering and gaps occur at connection points
Solution Approach 1:
The patent implements feedback control by using two EPC sensors to continuously monitor the position of running and new electrodes during the splicing process. The sensors detect meandering and position deviations in real-time, and this information is fed back to the control system which adjusts the splicing timing and positioning to minimize gaps and maintain alignment precision at connection points.
Solution Approach 2:
The patent applies preliminary action by performing position measurement and alignment correction before the actual splicing operation. The EPC sensors detect the position of both electrodes in advance, allowing the system to pre-adjust their alignment and minimize meandering before the electrodes are connected, thereby ensuring precise connection alignment.
3Duration of action of moving object
If electrode replacement is performed during unwinding, then electrode supply is maintained, but electrode gaps and overhang defects occur
Solution Approach 1:
The patent uses feedback control through dual EPC sensors that continuously monitor electrode positions during the replacement process. When the running electrode is being replaced with a new electrode, the sensors detect position deviations and feed this information back to the control system, which adjusts the timing and positioning to prevent gaps and overhang defects while maintaining continuous supply.
Data Source
AI summary
One aspect of the present disclosure relates to an auto-splicing device for an electrode and an auto-splicing method, and more particularly, to an auto-splicing device for an electrode and an auto-splicing method, which can minimize connection defects between the running electrode and the new electrode, wherein the running electrode and the new electrode connected and supplied to the running electrode are aligned on the basis of their coating lines by using the auto-slicing device.