Bare Cell Film Coating Using End-Cap Positioning for Insulation Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The insulation reliability of batteries, particularly lithium-ion batteries, is inferior due to inconsistent edge distances between the insulation film and insulation pieces during the coating process, leading to potential short-circuits and safety hazards.
Innovation Solution
A bare cell film coating apparatus that positions the cell assembly upside down, using the end cap component as a reference for precise alignment, and employs clamping assemblies with grippers and pressure exertion pieces to ensure consistent edge distances and improve fusion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation film is coated on the bare cell using conventional methods, then the coating process can be completed, but the edge distances between the insulation film and insulation pieces are inconsistent, leading to poor insulation reliability
Solution Approach 1:
The patent inverts the conventional coating approach by placing the cell assembly upside down on the supporting assembly, with the end cap component contacting the support. This inversion allows the end cap to serve as a precise positioning reference, enabling consistent edge distances between the insulation film and insulation pieces during the coating process, thereby improving both manufacturing precision and insulation reliability
Solution Approach 2:
The end cap component of the cell assembly itself is utilized as the positioning reference structure. By using the cell's own end cap (which has high processing precision) rather than external fixtures, the system achieves self-positioning capability that ensures consistent edge distances and improves insulation reliability without requiring additional complex positioning equipment
2Measurement precision
If external mechanical structures are used to realign the cell assembly, then positioning precision can be improved, but the device complexity increases
Solution Approach 1:
The end cap component of the cell assembly itself is utilized as the positioning reference structure. By using the cell's own end cap (which has high processing precision) rather than external fixtures, the system achieves self-positioning capability that ensures consistent edge distances and improves insulation reliability without requiring additional complex positioning equipment
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This application relates to a bare cell film coating apparatus and method, and a battery manufacturing system. The bare cell film coating apparatus includes: a supporting assembly, configured to support a cell assembly, where the cell assembly includes a bare cell and an end cap component connected to the bare cell; and a film coating assembly, configured to apply a coating of an insulation film to the bare cell in the cell assembly placed on the supporting assembly. The film coating assembly includes a mounting bracket and two clamping assemblies configured to clamp the insulation film. Both clamping assemblies are rotatably disposed on the mounting bracket around a rotation axis consistent with a first direction and are spaced out along a second direction. The second direction is perpendicular to the first direction. The insulation film in an unfolded state faces a first end face of the bare cell. The first end face is a surface that is of the bare cell and that is away from the end cap component. The two clamping assemblies are configured to coat the first end face and two first lateral faces of the bare cell with the insulation film in a state of having rotated to a first position toward the first lateral faces of the bare cell. The two first lateral faces intersect the first end face.