Battery Cap Assembly Structure for Stable Buckle-Edge Connection
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Solution Overview
Problem
The existing battery cell design has a short length of the flat section of the buckle edge, leading to poor operability and unstable electrical connections between the buckle edge and related components.
Innovation Solution
The cap assembly design includes a lid and an explosion-proof piece where the edge portion of the explosion-proof piece is positioned such that its plane does not exceed the plane of the second side surface, eliminating the wrapping edge and reducing the peripheral height of the cap assembly. This allows for an increased length of the flat section of the buckle edge, enhancing the electrical connection area and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap includes a wrapping edge structure, then the sealing performance is improved, but the peripheral height of the cap increases, reducing the length of the flat section of the buckle edge
Solution Approach 1:
The patent extracts the wrapping edge structure from the cap design, eliminating it completely. Instead of having the cap include a wrapping edge that would increase peripheral height and reduce the flat section length, the invention removes this feature entirely while maintaining sealing performance through alternative means.
Solution Approach 2:
The patent shifts the sealing mechanism from a vertical dimension (wrapping edge height) to a different dimensional approach by positioning the edge portion of the explosion-proof piece to align with the second side surface plane, effectively using planar alignment rather than vertical wrapping to achieve the sealing function.
2Reliability
If the peripheral height of the cap is increased to include wrapping edge, then the cap can wrap the sealing ring, but the total peripheral height of the cap assembly increases, limiting the available height for the steel shell
Solution Approach 1:
The patent removes the wrapping edge structure from the cap, extracting this volume-increasing feature while preserving the essential sealing function through the repositioned edge portion of the explosion-proof piece that aligns with the second side surface.
Solution Approach 2:
Instead of increasing cap height to achieve wrapping functionality, the invention inverts the approach by reducing cap height and using the edge portion positioning to achieve the same sealing effect, effectively doing the opposite of the conventional design.
3Reliability
If the length of the flat section of the buckle edge is increased, then the electrical connection stability is improved, but the available height dimension of the steel shell is reduced
Solution Approach 1:
The patent extracts the wrapping edge structure that was consuming vertical space, thereby freeing up height dimension in the steel shell that can be reallocated to increase the flat section length of the buckle edge for improved electrical connection.
Solution Approach 2:
The invention changes the dimensional strategy by using planar positioning (edge portion at the same plane as second side surface) rather than vertical wrapping, which frees up vertical space that can be used to extend the flat section length in the horizontal dimension.
Data Source
Figure 1
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Figure 3~4
AI summary
The present disclosure provides a cap assembly (001), a battery cell, and a battery. The cap assembly (001) includes a cap (012). The cap (012) includes a lid (121) and an explosion-proof piece (122). The lid (121) has a first side surface and a second side surface arranged oppositely. The explosion-proof piece (122) is partially attached to the first side surface and is provided with an edge portion (1222) at a periphery of the explosion-proof piece (122). The edge portion (1222) is provided on the periphery of the lid (121), and a plane where a top surface of the edge portion (1222) is located does not exceed a plane where the second side surface is located.