Cylindrical Battery Current Collector Wing Structure for Stable Welding
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Solution Overview
Problem
Welding defects occur in cylindrical secondary batteries due to dispersion of the electrode assembly height, beading part height, and poor positioning of the negative electrode current collector plate's wings, leading to unreliable connections.
Innovation Solution
A cylindrical secondary battery design featuring a second current collector plate with a body part and a ring-shaped wing part, including coupling parts and slots, which are strategically positioned and coupled to the case to absorb height dispersion and ensure stable welding, thereby preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a negative electrode current collector plate with multiple integrated wings is used and connected to the beading part through laser welding, then electrical connection is achieved, but welding defects occur due to height dispersion and poor positioning
Solution Approach 1:
The current collector plate is divided into a body part and a separate wing part that can be independently positioned and attached. This segmentation allows the wing part to be precisely positioned on the beading part without being affected by height variations in the electrode assembly, thereby improving welding reliability while maintaining manufacturing precision.
Solution Approach 2:
The wing part acts as an intermediary component between the body part and the beading part. It provides a stable interface for laser welding by creating a consistent welding surface that compensates for height dispersion, enabling reliable electrical connection without positioning defects.
2Adaptability or versatility
If the total height of the electrode assembly varies, then manufacturing flexibility is improved, but welding quality deteriorates due to height dispersion
Solution Approach 1:
The design allows the wing part to be adjusted in position and orientation to compensate for variations in electrode assembly height. By changing the spatial parameters of the wing part's attachment point, the system maintains consistent welding quality across different manufacturing batches while preserving manufacturing flexibility.
3Ease of manufacture
If the wings of the current collector plate are not precisely positioned, then assembly ease is improved, but connection stability deteriorates
Solution Approach 1:
The wing part is pre-positioned and attached to the body part before final assembly with the electrode assembly. This preliminary action ensures that the wing part is already in the correct position and orientation, maintaining connection stability while simplifying the overall assembly process by reducing the need for precise positioning during final assembly.
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 design effectively eliminates welding defects by stabilizing the connection between the electrode assembly and the case, ensuring reliable electrical contact and mechanical integrity.
Implementation Method 1
a ring-shaped wing part, including coupling parts and slots, which are strategically positioned and coupled to the case to absorb height dispersion
Implementation Method 2
A method for connecting the wings of the negative electrode current collector plate to a beading part of the can through laser welding
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Provided is a battery. The battery includes an electrode assembly (120) including a first electrode plate (121), a separator (123), and a second electrode plate (122), a first current collector plate (130) contacting a bottom surface of the electrode assembly (120), and electrically connected to the first electrode plate (121), a second current collector plate (140, 240)contacting a top surface of the electrode assembly (120), and electrically connected to the second electrode plate (122), a case (110) for accommodating the electrode assembly (120), the first current collector plate (130), and the second current collector plate (140, 240), and electrically connected to the second current collector plate (140, 240), and a cap plate (160) for sealing an upper portion of the case (110), wherein the second current collector plate (140, 240) includes a body part (141, 241) coupled to the second electrode plate (122), and a wing part (142, 242) fixed to the body part (141, 241) and the case (110).