Battery Cell End Cover Assembly With Three-Part Terminal Insulation
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Solution Overview
Problem
Existing battery technologies suffer from poor safety, leading to fire or explosion accidents due to short circuits between electrode terminals and internal components.
Innovation Solution
An end cover assembly with an insulating member comprising a first, second, and third insulating portion, which covers the mounting hole and separates the electrode terminal from the end cover, preventing short circuits and enhancing safety by using a connector and sealing members to prevent electrolyte leakage and impurity entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal directly contacts the mounting hole inner wall for structural simplicity, then device complexity is reduced, but short circuit risk increases leading to poor safety
Solution Approach 1:
The patent introduces an insulating member as an intermediary component between the electrode terminal and the mounting hole inner wall. This insulating member includes a first insulating portion covering the outer surface of the electrode terminal, a second insulating portion covering the inner wall of the mounting hole, and a third insulating portion connecting these two portions. This intermediary structure effectively prevents direct contact and potential short circuits while maintaining a manageable device complexity through modular insulation design.
2Reliability
If the insulating member extends fully beyond the end cover for complete insulation, then insulation effectiveness is improved, but the height of the end cover assembly increases
Solution Approach 1:
The patent applies local quality by designing the insulating member with different portions serving specific local functions. The first insulating portion locally covers the electrode terminal outer surface, the second insulating portion locally covers the mounting hole inner wall, and the third insulating portion locally bridges between them. This localized insulation approach ensures effective insulation at critical contact points without requiring the entire insulating member to extend fully beyond the end cover, thus controlling the overall height.
3Power
If the connector is added to improve electrical energy output capability, then power output is enhanced, but short circuit risk between connector and end cover increases
Solution Approach 1:
The patent introduces a first insulating portion as an intermediary element positioned between the connector and the end cover. This first insulating portion covers the outer surface of the electrode terminal where the connector makes contact, creating an insulating barrier that prevents direct electrical contact between the conductive connector and the conductive end cover. This allows the connector to fulfill its power output function while the insulating intermediary prevents harmful short circuits.
Data Source
AI summary
The present application provides an end cover assembly, a battery cell, a battery, and an electrical device, relating to the field of batteries. The end cover assembly includes an end cover, an electrode terminal, and an insulating member. The end cover is used for closing an opening of a shell. The end cover has a mounting portion, which confines a mounting hole. The electrode terminal at least partially passes through the mounting hole. The insulating member includes a first insulating portion, a second insulating portion, and a third insulating portion connected sequentially. The second insulating portion is at least partially located in the mounting hole, and the first insulating portion and the third insulating portion are separately located on two sides of the mounting portion in a thickness direction of the end cover to cover the mounting portion.