Adjustable Winding Needle for Battery Tab Alignment
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Solution Overview
Problem
The alignment of tabs in electrode plates during the winding process is often affected by variations in thickness and tension, leading to misalignment issues in electrode assemblies, which impact the quality of the battery.
Innovation Solution
A winding device with a piezoelectric assembly between inner and outer winding needles to adjust the circumference of the outer needle, controlled by a driving voltage based on tab misalignment, allowing for precise adjustment of the outer needle's position relative to the inner needle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed circumference winding needle is used, then the structure is simple, but tab misalignment occurs due to thickness and tension variations
Solution Approach 1:
The winding needle structure is transformed from fixed to adjustable by introducing a movable outer winding needle that can change its circumference dynamically. The outer needle is configured to move radially relative to the inner winding needle, allowing the circumference to be adjusted according to actual winding requirements and compensate for tab misalignment caused by thickness and tension variations.
Solution Approach 2:
The circumference parameter of the winding needle is made variable through the adjustable outer needle structure. By changing the radial position of the outer winding needle relative to the inner winding needle, the effective circumference can be adjusted to compensate for misalignment issues, thereby improving tab alignment precision without significantly complicating the overall structure.
2Manufacturing precision
If the outer winding needle circumference is adjusted to reduce tab misalignment, then alignment precision improves, but the device complexity increases
Solution Approach 1:
The winding needle is divided into an inner winding needle and an outer winding needle that can move independently. This segmentation allows the outer needle to be adjusted separately to change the circumference, providing a simple yet effective way to improve alignment precision without requiring complete structural redesign.
Solution Approach 2:
The outer winding needle is designed to surround the inner winding needle, forming a nested structure. This nesting arrangement allows the outer needle to move radially while maintaining a compact overall structure, improving alignment precision without significantly increasing device complexity or occupying excessive space.
3Measurement precision
If piezoelectric assembly is added to control outer needle movement, then circumference adjustment precision improves, but device complexity and cost increase
Solution Approach 1:
The piezoelectric assembly is introduced to replace complex mechanical adjustment mechanisms with a more compact and precise electro-mechanical system. The piezoelectric actuator can achieve precise radial movement of the outer winding needle through voltage control, improving circumference adjustment precision while actually reducing the complexity of mechanical linkages and adjustment mechanisms.
Solution Approach 2:
The piezoelectric assembly enables precise control of the outer winding needle's radial position by changing electrical parameters (voltage). This electrical control method provides high precision circumference adjustment with a compact structure, improving measurement precision without requiring complex mechanical measurement and adjustment systems.
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 solution effectively reduces tab misalignment by adjusting the circumference of the outer winding needle, ensuring high-quality electrode assembly production with improved efficiency and safety by minimizing mechanical interference.
Implementation Method 1
a piezoelectric assembly, disposed between the outer winding needle and the inner winding needle and configured to control the outer winding needle to move relative to the inner winding needle to adjust a circumference of the outer winding needle
Data Source
AI summary
A winding device and a winding method. The winding device includes a winding mechanism configured to wind an electrode plate to form an electrode assembly. The winding mechanism includes: a winding needle assembly, including an inner winding needle and an outer winding needle surrounding the inner winding needle; and a piezoelectric assembly, disposed between the outer winding needle and the inner winding needle and configured to control the outer winding needle to move relative to the inner winding needle to adjust a circumference of the outer winding needle.