Battery Top Cover Pole Sealing Structure Against Metal Debris
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Solution Overview
Problem
The secondary battery's top cover assembly experiences poor sealing between the lower plastic component and the pole, leading to metal debris falling off and causing short circuits, which affects its operation performance.
Innovation Solution
A top cover assembly design with a seal ring that sealingly abuts against both the top cover plate and the press ring, with its inner side wall abutting the pole's outer peripheral wall or insertion portion, and outer side wall abutting the second pole hole's hole wall, ensuring insulation and sealing in both axial and radial directions, preventing metal debris from entering the gap and causing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower plastic component is mounted to the top cover plate without additional sealing structures, then the device complexity is reduced, but the sealing between the lower plastic component and the pole deteriorates, causing metal debris to fall off and create short circuits
Solution Approach 1:
A seal ring is introduced as an intermediary component between the lower plastic component and the pole. The seal ring has a first surface that sealingly abuts against the top cover plate and a second surface that sealingly abuts against the press ring, creating an intermediate sealing layer that prevents metal debris from falling off and causing short circuits.
Solution Approach 2:
The sealing function is segmented into multiple surfaces of the seal ring: the first surface seals against the top cover plate, the second surface seals against the press ring, the inner side wall seals against the pole or insertion portion, and the outer side wall seals against the second pole hole hole wall. This segmentation allows each surface to address specific sealing requirements independently.
2Reliability
If the seal ring seals only against the top cover plate and press ring in the axial direction, then the manufacturing process is simplified, but the sealing in the radial direction between the second pole hole and the pole deteriorates, allowing metal debris to enter and cause short circuits
Solution Approach 1:
The sealing is extended from the axial direction to the radial direction by designing the seal ring with inner and outer side walls. The inner side wall sealingly abuts against the outer peripheral wall of the pole or side wall of the insertion portion, while the outer side wall sealingly abuts against the hole wall of the second pole hole, creating radial sealing that prevents metal debris from entering the gap between the pole and second pole hole.
Data Source
AI summary
Provided are a top cover assembly, a secondary battery, a battery module, and an electricity-consumption device. The top cover assembly includes a top cover plate, a lower plastic component, a pole, an upper plastic component, a press ring, and a seal ring. A first pole hole is formed at the top cover plate. A second pole hole is defined in the lower plastic component. In a thickness direction of the top cover plate, a surface of the seal ring sealingly abuts against the top cover plate, and another surface of the seal ring sealingly abuts against the press ring. An inner side wall of the seal ring sealingly abuts against an outer peripheral wall of the pole or a side wall of an insertion portion, and an outer wall sealingly abuts against a hole wall of the second pole hole.