Wound Battery Electrode Tab Layout for Accurate Winding Detection
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Solution Overview
Problem
Conventional battery manufacturing methods experience winding errors due to the inclination of electrode tabs, leading to inconsistent tab positions and difficulties in establishing a stable electrical connection during the winding process.
Innovation Solution
Incorporating a combination of straight and non-straight electrode tabs with specific dimensions and configurations, including a detection tab with a straight part, to minimize positional variations and ensure accurate cutting during the winding process, thereby enhancing the strength and reliability of the electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode tabs with isosceles trapezoidal shapes are used, then the electrode plate can be wound, but winding errors occur causing variation in tab positions
Solution Approach 1:
The patent applies asymmetry by designing the detection tab with a straight side that is perpendicular to the longitudinal direction of the electrode plate, while other tabs maintain isosceles trapezoidal shapes. This asymmetric design of the detection tab allows it to serve as a reliable reference for detecting the winding amount, preventing position variations that would occur with symmetric isosceles trapezoidal tabs alone.
2Manufacturing precision
If the detection tab has a straight part perpendicular to the longitudinal direction, then winding errors are reduced, but the tab structure becomes more complex
Solution Approach 1:
The patent applies local quality by making only the detection tab have a straight side perpendicular to the longitudinal direction, while other electrode tabs maintain the conventional isosceles trapezoidal shape. This localized modification minimizes structural complexity while providing the necessary reference function for accurate winding detection and cutting.
3Reliability
If multiple electrode tabs are superimposed during winding, then electrical connection is established, but position variation makes stable connection difficult
Solution Approach 1:
The patent applies feedback by using the detection tab with the straight side as a reference for detecting the winding amount. The detection mechanism monitors the position of this straight side during winding, providing feedback that allows the system to maintain accurate cutting positions and ensure consistent superimposition of multiple tabs, thereby achieving stable electrical connections.
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
This configuration reduces winding errors, improves the strength and stability of electrode tabs, and facilitates a stable electrical connection, even under shock and vibration, while allowing for balanced charging and discharging of multiple wound electrode bodies.
Implementation Method 1
a detection mechanism that detects the positions of the electrode tabs on the electrode plate with a laser
Data Source
AI summary
The battery disclosed here comprises one or more wound electrode bodies each composed of a strip-shaped first electrode plate and a strip-shaped second electrode plate superimposed and wound together with a strip-shaped separator between the two, and a battery case containing the wound electrode body or bodies. The first electrode plate has multiple electrode tabs protruding from an edge extending in the longitudinal direction, and the multiple electrode tabs include a first electrode tab having a straight part that is roughly perpendicular to the edge and has a length of at least 2 mm in the direction orthogonal to the edge, and second electrode tabs lacking the straight part.