Battery Cover Assembly with Segmented Extraction Terminal
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Solution Overview
Problem
Conventional battery cover assemblies face challenges in achieving both effective sealing and easy welding due to insufficient welding areas, which compromises the reliability and safety of power batteries in new energy vehicles.
Innovation Solution
A battery cover assembly design featuring a columnar seal part, a position part, and a sheet-like weld part with an arc-shaped transition, along with an insulating seal member, enhances sealing and simplifies the welding process between the extraction electrode terminal and the battery tab.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extraction electrode terminal with a columnar structure is used, then sealing of the battery is improved, but welding area between the extraction electrode terminal and tab is insufficient
Solution Approach 1:
The extraction electrode terminal is segmented into distinct functional parts: a columnar seal part for sealing, a position part for positioning, and a weld part for welding. This segmentation allows each part to optimize its specific function while working together as an integrated structure.
Solution Approach 2:
The weld part extends horizontally from the vertical columnar seal part, transitioning from a one-dimensional columnar structure to a two-dimensional structure with both vertical and horizontal components. This dimensional change provides sufficient welding area while maintaining the sealing effectiveness of the columnar seal part.
2Area of stationary object
If an extraction electrode terminal with a sheet structure is used, then welding area between the extraction electrode terminal and tab is increased, but sealing of the power battery deteriorates
Solution Approach 1:
The terminal structure is divided into a columnar seal part that maintains sealing integrity and a sheet-like weld part that provides adequate welding area. This segmentation resolves the contradiction by assigning different geometric forms to different functional requirements.
Solution Approach 2:
Different parts of the extraction electrode terminal have different local qualities: the seal part has a columnar geometry optimized for sealing, while the weld part has a sheet-like geometry optimized for welding. This local differentiation allows each region to perform its specific function effectively.
3Ease of manufacture
If the extraction electrode terminal structure is simplified, then manufacturing is easier, but welding process complexity increases due to insufficient welding area
Solution Approach 1:
The terminal is designed with segmented functional parts that can be formed in a single stamping or extrusion process, maintaining manufacturing simplicity while creating the complex geometry needed for adequate welding area through the integrated design of seal part, position part, and weld part.
Data Source
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AI summary
A battery and a battery cover assembly thereof are provided. The battery cover assembly comprises a cover (1) having a through hole; an extraction electrode terminal (3); and an insulating seal member disposed between the cover and the extraction electrode terminal. The extraction electrode terminal (3), starting from its top, includes a columnar seal part (31), a position part (32) and a weld part (33) that are consecutively connected together, the columnar seal part (31) passing through the through hole of the cover and having a seal groove formed along a circumferential surface thereof, the position part having a horizontally-oriented platform, and the weld part having a sheet-like shape and being perpendicular to the horizontally-oriented platform of the position part.