Riveted Battery Cover Plate Assembly for Compact Cell Grouping
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Solution Overview
Problem
Cylindrical batteries face issues with complex battery arrangement, increased production costs, and reduced energy density due to the placement of positive and negative connection terminals at opposite ends, leading to complex wiring and potential errors in grouping.
Innovation Solution
The pole and cover plate are fixed using riveting, with the pole penetrating the cover plate and being riveted, and optionally incorporating a pressing block and insulating sealing ring for improved sealing and electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the positive and negative connection terminals are arranged at opposite ends of the cylindrical battery, then the battery structure is simple, but the battery arrangement complexity increases, production cost increases, and energy density decreases
Solution Approach 1:
The patent merges the positive and negative connection terminals to the same side of the battery through the cover plate structure. The cover plate integrates both terminals, allowing batteries to be arranged in series without requiring opposite-end terminal placement, thereby simplifying battery grouping and improving production efficiency
2Reliability
If the current collecting plate has a long electrical connection path with the pole, then the connection is stable, but the thermal conductivity deteriorates
Solution Approach 1:
The patent transitions from a long linear electrical connection path to a direct face-to-face contact configuration. The current collecting plate contacts the pole end face directly, reducing the electrical connection path length while dramatically improving thermal conductivity through increased contact area
3Strength
If the pole and cover plate are fixed by welding, then the connection strength is high, but the production efficiency decreases and production cost increases
Solution Approach 1:
The patent replaces the welding process with a mechanical pressing fixation method. The pressing block applies pressure to secure the pole to the cover plate, eliminating complex welding operations while maintaining adequate connection strength and significantly improving production efficiency
Data Source
AI summary
Provided is a battery assembly, which includes a cover plate and a pole. The pole penetrates the cover plate and is fixed with the cover plate by riveting. For the battery assembly provided by the application, the pole and the cover plate are fixed by riveting. Compared with the fixing method of welding, it not only simplifies the fixing operation, improves the production efficiency, but also reduces the production cost. Also provided are a preparation method of a battery assembly, a battery and an electric vehicle.