Full-Tab Cylindrical Battery Cap for Timely Pressure Relief
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Solution Overview
Problem
The existing cylindrical lithium battery cap fails to timely disconnect the notch on the explosion-proof disc under high internal pressure, posing a risk of short circuit and safety hazards.
Innovation Solution
A full-tab cylindrical lithium battery cap design featuring an explosion-proof valve with a thicker connecting portion and thinner explosion-proof portion, along with an isolation ring and sealing ring, ensures timely rupture and gas release to prevent short circuits, while allowing direct electrical connection to reduce contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a top cover is added to the cap to improve structural strength, then the overall strength is improved, but the notch on the explosion-proof disc cannot be disconnected in time under high pressure, causing short circuit risk
Solution Approach 1:
The invention removes the top cover from the cap structure, extracting the problematic component that prevented timely notch disconnection. The cap now consists of only the explosion-proof disc, isolation ring, connecting plate, and sealing ring, allowing the explosion-proof disc to rupture and disconnect the notch immediately when internal pressure exceeds the threshold, eliminating the short circuit risk while maintaining adequate structural strength through the optimized remaining components.
2Reliability
If many structural parts are included in the cap to improve safety performance, then the safety performance is improved, but the device complexity increases
Solution Approach 1:
The invention simplifies the cap structure by removing the top cover, reducing the number of parts from five components to four components. This extraction eliminates unnecessary complexity while preserving the essential safety functions through the optimized explosion-proof disc, isolation ring, connecting plate, and sealing ring configuration.
Solution Approach 2:
The invention merges the functions of the cap into fewer components. The explosion-proof disc integrates the pressure sensing and rupture functions, the isolation ring combines electrical isolation and structural support, and the connecting plate serves as both mechanical connector and electrical conductor, reducing overall system complexity while maintaining safety performance.
3Reliability
If nickel-plated steel components are used to improve corrosion resistance, then the corrosion resistance is improved, but the contact resistance increases
Solution Approach 1:
The invention employs composite material strategy by using aluminum for the explosion-proof disc and connecting plates, which provides both excellent electrical conductivity (low contact resistance) and adequate corrosion resistance. The aluminum material optimizes the balance between electrical performance and corrosion protection, eliminating the need for nickel plating that would increase contact resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures safety by timely pressure relief and reduced contact resistance, enhancing the battery's safety performance and market competitiveness by eliminating the need for a top cover and nickel-plated steel components.
Implementation Method 1
when the internal pressure of the battery is too high, the rupture line on the explosion-proof valve is broken, and the explosion-proof valve is broken, and the gas flow will be released
Data Source
AI summary
This application is applicable to the technical field of lithium batteries, and provides a full-tab cylindrical lithium battery cap and a full-tab cylindrical lithium battery, including an explosion-proof valve, an isolation ring, a connecting plate and a sealing ring, and the isolation ring is arranged between the explosion-proof valve and the connecting plate, the sealing ring is sleeved on an edge of the explosion-proof valve; the explosion-proof valve includes a connecting portion and an explosion-proof portion, the connecting portion is arranged along a circumference of the explosion-proof portion, and the edge of the connecting portion abuts on the sealing ring, the explosion-proof portion is provided with a rupture line, and the connecting portion is thicker than the explosion-proof portion. The full-tab cylindrical lithium battery cap provided in this application is formed by combining an explosion-proof valve, an isolation ring, a connecting plate and a sealing ring.