Multi-Layered CID Design for Reliable Battery Circuit Disconnection
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Solution Overview
Problem
Conventional Circuit Interrupt Devices (CIDs) in batteries fail to reliably break the electrical circuit during abnormal pressure and temperature events, posing safety hazards due to incomplete disconnection and requiring additional insulation that can cause manufacturing and operational issues.
Innovation Solution
A multi-layered CID design that forces electric current through a thin, fragile element, ensuring the circuit is broken upon abnormal pressure events by traversing the bursting disc fracture point, even in cases of incomplete bursts, eliminating the need for additional insulation and simplifying the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CID arrangements are used, then the device complexity is reduced, but the reliability of circuit disconnection during abnormal pressure events deteriorates
Solution Approach 1:
The CID is divided into multiple functional layers: a PTC layer for current limiting and a bursting disc layer for pressure relief. The bursting disc is further segmented into a fragile element that traverses the fracture point, ensuring complete circuit disconnection. This segmentation allows each layer to perform its specific function reliably without interfering with others.
Solution Approach 2:
The fragile element is positioned to traverse the bursting disc fracture point in a specific orientation, creating a geometric relationship that ensures circuit disconnection. By arranging the fragile element to cross the fracture point rather than merely adjacent to it, the design ensures that any burst, regardless of direction, will break the electrical circuit.
2Reliability
If additional insulation is added to ensure complete disconnection, then the reliability improves, but the manufacturing complexity and operational issues increase
Solution Approach 1:
The patent removes the need for additional insulation materials by integrating the disconnection function directly into the CID structure through the fragile element. The fragile element itself serves as both the structural component and the circuit interruption mechanism, eliminating the separate insulation layer that caused manufacturing complexity.
Solution Approach 2:
The fragile element automatically performs the circuit disconnection function through its own structural failure when the bursting disc fractures. The element's traversal of the fracture point means it self-interrupts the circuit without requiring external insulation or additional disconnection mechanisms.
3Ease of manufacture
If the CID uses a simple structure, then the ease of manufacture is improved, but the ability to ensure complete circuit break during abnormal events deteriorates
Solution Approach 1:
The PTC layer and bursting disc layer are merged into a single integrated CID structure, with the fragile element serving dual purposes: maintaining structural integrity during normal operation and ensuring circuit disconnection during bursts. This merging eliminates the need for separate insulation components while maintaining manufacturing simplicity.
Solution Approach 2:
The fragile element is positioned specifically at the critical location where it traverses the bursting disc fracture point, concentrating the disconnection function at the most effective location. This local placement ensures that the simple structure achieves complete circuit break reliability without requiring complex arrangements throughout the entire CID.
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
The multi-layered CID design provides reliable and complete electrical path disconnection during abnormal events, enhancing battery safety, reducing manufacturing complexity, and ensuring the circuit is broken with high probability, even in partial disc bursts, thus addressing the shortcomings of conventional designs.
Implementation Method 1
a current interrupt device configured to restrict an electric current through a fragile element configured to traverse at least one bursting disc fracture point
Data Source
AI summary
The invention broadly provides improved safety features for batteries utilized in electronic devices. The invention provides an improved CID design that allows for more reliable disconnection (breaking the electrical circuit) during abnormal pressure or temperature events inside the cell. The invention provides a multi-layered CID configured to force electric current through a thin, fragile element such that the thin, fragile element is broken upon any abnormal pressure and temperature event.