Secondary Battery Electrode Tab Cutting Without Notching
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Solution Overview
Problem
The manufacturing process of secondary batteries is time-consuming and prone to defects due to the notching process, which causes burrs and delamination during the formation of electrode tabs.
Innovation Solution
A method that omits the notching process by forming a display part on the non-coating portions of electrodes, cutting these portions to create electrode tabs, and reinforcing the uncut parts to enhance bonding strength and protect against external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the notching process is used to form electrode tabs, then the electrode tabs can be created, but the manufacturing time increases and defects such as burrs and delamination occur
Solution Approach 1:
The patent extracts and removes the notching process from the manufacturing sequence entirely. Instead of cutting notches into completed electrodes, the method processes electrodes while they are in a stacked, unbonded state, eliminating the separate notching step that causes time loss and defects.
Solution Approach 2:
The patent performs the tab formation action preliminarily by cutting the stacked electrodes before they are bonded together. This preliminary cutting action on the stacked state allows for more efficient processing compared to post-bonding notching, reducing overall manufacturing time and preventing delamination issues.
2Ease of manufacture
If the notching process is used to form electrode tabs, then the electrode tabs can be created, but defects such as burrs and delamination occur
Solution Approach 1:
The patent extracts and removes the notching process from the manufacturing sequence entirely. Instead of cutting notches into completed electrodes, the method processes electrodes while they are in a stacked, unbonded state, eliminating the separate notching step that causes time loss and defects.
Solution Approach 2:
The patent performs the tab formation action preliminarily by cutting the stacked electrodes before they are bonded together. This preliminary cutting action on the stacked state allows for more efficient processing compared to post-bonding notching, reducing overall manufacturing time and preventing delamination issues.
3Ease of manufacture
If the notching process is used to form electrode tabs, then the electrode tabs can be created, but the process complexity increases
Solution Approach 1:
The patent merges the electrode stacking and tab formation operations into a single integrated process. By cutting the stacked electrodes before bonding, the method combines what would otherwise be separate operations (stacking, then notching), thereby simplifying the overall manufacturing process and reducing the number of discrete steps.
Data Source
AI summary
The present invention relates to a method for manufacturing a secondary battery. The method for manufacturing the secondary battery comprises: an electrode preparation step of preparing electrodes, each of which is provided with a coating portion coated with an electrode active material and a non-coating portion that is not coated with the electrode active material; an electrode assembly manufacturing step of alternately stacking the electrodes and separators to manufacture an electrode assembly, wherein the electrodes are stacked so that the non-coating portions overlap each other; a non-coating portion bonding step of bonding the non-coating portions to each other; a display part formation step of forming a display part for setting a cutting point on a surface of the bonded non-coating portion of each of the electrodes; and an electrode tab manufacturing step of cutting the bonded non-coating portion adjacent to the display part to manufacture an electrode tab.