Battery Cell Terminal Structure for Temperature-Triggered Current Switching
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Solution Overview
Problem
Existing battery cell terminals lack effective temperature-dependent current path management, which can lead to overheating and potential safety hazards during high-temperature conditions.
Innovation Solution
The integration of a terminal with a dual-material structure, where a first material with a higher melting point forms a continuous electrical path and a second material with a lower melting point is contained in an intermediate portion, allowing the electrical path to change based on temperature, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-material terminal structure is used, then the terminal has simple structure and high manufacturing precision, but it cannot provide temperature-dependent current path management and may overheat during high-temperature conditions
Solution Approach 1:
The terminal is segmented into multiple materials with different melting points (first material and second material). Each material forms a separate electrical path (first electrical path and second electrical path), allowing the terminal to provide temperature-dependent current path management while maintaining structural clarity and manufacturability.
2Reliability
If dual-material structure with different melting points is used, then temperature-dependent current path switching is enabled, but manufacturing complexity increases
Solution Approach 1:
The terminal employs local quality by using materials with different melting points in specific locations. The second material (lower melting point) is positioned to form the second electrical path, while the first material (higher melting point) forms the first electrical path. This local differentiation enables automatic current path switching based on temperature without requiring complex control systems.
3Adaptability or versatility
If only one electrical path is provided, then the terminal structure is simple, but it cannot dynamically manage current flow under varying temperature conditions
Solution Approach 1:
The terminal provides dynamic current path management through its dual-material structure. At normal temperatures, both the first and second electrical paths conduct current. When temperature exceeds the melting point of the second material, that path opens automatically, dynamically switching all current to the first electrical path. This dynamic adaptation occurs passively through material phase change.
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
This solution effectively manages current flow by switching to a single path when the terminal exceeds a certain temperature, preventing overheating and ensuring safe and reliable operation of the battery cell.
Implementation Method 1
The second material has a lower melting point than the first material such that the second electrical path opens responsive to a temperature of the terminal exceeding the melting point of the second material
Data Source
AI summary
A battery cell comprises a housing, a current collector having a main body disposed in the housing and a terminal substrate extending from the housing and defining a cutout, and an electrically conductive filler material. The electrically conductive filler material is disposed within the cutout and cooperates with the substrate to form a terminal configured to connect with a load. The filler material has a lower melting point than the substrate and further cooperates with the substrate such that electric flux flows through both the substrate and the filler material when a temperature of the terminal is below a melting point of the filler material, and electric flux flows through only the substrate when the temperature of the terminal exceeds the melting point of the filler material.