Lead Tab Bending Control for Higher-Density Secondary Batteries
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Solution Overview
Problem
Existing secondary battery manufacturing processes struggle to effectively adjust the bending position and angle of lead tabs, which affects the energy density of the battery.
Innovation Solution
A secondary battery manufacturing apparatus and method that utilizes a support member with jigs and bending members to precisely control the formation of bending parts on lead tabs, including a first bending member to form a first bending part on the electrode lead and a second bending member to form a second bending part on the electrode tab, using a combination of movable and rotatable components to achieve controlled bending angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a lead tab is bent to reduce volume, then the volume occupied by the lead tab is reduced, but the bending position and angle cannot be effectively adjusted
Solution Approach 1:
The bending process is divided into two independent stages: first bending the electrode lead relative to the electrode tab, then bending the electrode tab relative to the electrode assembly. This segmentation allows each bending operation to be precisely controlled independently, achieving both volume reduction and precise bending position/angle control.
Solution Approach 2:
The apparatus uses movable and rotatable components including a pressing block that can move in a direction inclined at an angle θ (45°≤θ≤90°) relative to the first direction, and a first jig that can rotate about a rotation axis. These dynamic elements enable precise adjustment of bending position and angle while maintaining compact battery volume.
2Quantity of substance
If the lead tab is bent using conventional methods, then the battery volume is reduced, but the energy density cannot be improved due to insufficient bending control
Solution Approach 1:
The first bending member includes a pressing block movable in a direction inclined at angle θ (45°≤θ≤90°) relative to the first direction, enabling precise control of the first bending part's position and angle. The second bending member includes a first jig rotatable about a rotation axis, enabling precise control of the second bending part's position and angle. This dynamic control capability improves energy density by optimizing lead tab configuration while maintaining ease of operation.
Solution Approach 2:
The apparatus controls bending parameters including the inclination angle θ of the pressing block movement (45°≤θ≤90°), the rotation angle of the first jig about its rotation axis, and the positioning of jigs relative to the lead tab. By adjusting these parameters, the system optimizes bending configuration to improve energy density while maintaining operational ease.
3Manufacturing precision
If multiple bending operations are performed on the lead tab, then the bending position and angle can be controlled, but the device complexity increases
Solution Approach 1:
The bending operation is segmented into two distinct stages performed by separate bending members: the first bending member forms the first bending part on the electrode lead, and the second bending member forms the second bending part on the electrode tab. This segmentation achieves precise bending control while keeping each individual bending member relatively simple in structure.
Solution Approach 2:
The support member integrates multiple functions: it supports the lead tab during bending, provides mounting for both bending members, and includes a guide jig that guides the electrode assembly. The first jig serves both as a bending tool and as a support structure. These merging strategies reduce overall device complexity while maintaining precise bending control capability.
Data Source
AI summary
The present disclosure relates to a secondary battery manufacturing apparatus and a secondary battery manufacturing method that are capable of adjusting a bending position and angle of a lead tab and improving energy density of a secondary battery. To this end, the present disclosure provides an secondary battery manufacturing apparatus, including a support member configured to support a lead tab including an electrode tab extending from an electrode assembly and an electrode lead connected to the electrode tab, a first bending member spaced apart from the support member and configured to press the electrode lead such that a first bending part is formed on the electrode lead, and a second bending member connected to the support member and configured to move the support member such that a second bending part is formed on the electrode tab.