Battery Cell End Cover Venting Layout for Compact Breathable Film
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Solution Overview
Problem
Existing end cover assemblies for lithium ion batteries occupy a large space due to the arrangement of the breathable film, which is connected to the cover plate and overlaps with the pressure relief hole, leading to an increased size of the battery cell.
Innovation Solution
The breathable film is fixed to the cover plate by a fixing member, arranged opposite to the pressure relief hole, ensuring that its projection does not overlap with the cover plate's projection in the thickness direction, reducing the radial dimension and space occupied by the breathable film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the breathable film is connected to the cover plate and overlaps with the pressure relief hole, then the breathable film can be securely fixed, but the radial dimension and space occupied by the breathable film increases
Solution Approach 1:
The breathable film is arranged opposite to the pressure relief hole such that its projection in the thickness direction does not overlap with the projection of the cover plate. This spatial reconfiguration in the thickness dimension reduces the radial dimension and space occupied by the breathable film while maintaining secure fixation through the fixing member.
Solution Approach 2:
The fixing member is designed to extend into the pressure relief hole, with the breathable film fixed to the fixing member. This nested arrangement allows the breathable film to be securely positioned without requiring additional radial space, as the fixing member utilizes the existing space within the pressure relief hole structure.
2Reliability
If the breathable film occupies a large space, then it can provide sufficient sealing and breathability, but the size of the battery cell increases
Solution Approach 1:
By arranging the breathable film opposite to the pressure relief hole in the thickness direction, the invention maintains the breathable film's sealing and breathability functions while significantly reducing the radial space it occupies, thereby reducing the overall battery cell size.
Solution Approach 2:
The breathable film is configured as a thin film structure that provides sufficient sealing and breathability through its material properties and strategic positioning, rather than through increased size. The fixing member ensures the thin film maintains its functional integrity.
3Volume of moving object
If the breathable film is arranged to not overlap with the cover plate projection, then the radial dimension is reduced, but the connection and sealing reliability may be compromised
Solution Approach 1:
The fixing member serves as an intermediary component that connects the breathable film to the cover plate assembly. It extends into the pressure relief hole and provides a reliable connection point for the breathable film, ensuring sealing reliability even when the breathable film's projection does not overlap with the cover plate projection.
Solution Approach 2:
The fixing member is nested within the pressure relief hole structure, providing a secure anchor point for the breathable film. This nested configuration maintains connection reliability by utilizing the existing structural space rather than requiring additional radial overlap between the breathable film and cover plate.
Data Source
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AI summary
The application relates to an end cover assembly, a battery cell, a battery, and a device and method for manufacturing a battery cell. The end cover assembly is used for a battery cell, and includes a cover plate, the cover plate is provided with a pressure relief hole penetrating through the cover plate in a thickness direction, a breathable film, arranged opposite to the pressure relief hole and configured to exhaust gas inside the battery cell, a projection of the breathable film in the thickness direction does not overlap with a projection of the cover plate in the thickness direction; and a fixing member, configured to connect the cover plate to fix the breathable film. The application intends to solve the problem of a large space occupied by the breathable film.