Battery Cell Tab Element Positioning for Thermal Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Standard PTC/TCO arrangements in battery cells often fail to accurately sense the internal temperature due to factors like inappropriate placement, material choice, and geometry considerations, leading to inaccurate thermal event detection and potential cell damage or fire.
Innovation Solution
The solution involves optimizing the PTC/TCO arrangements by positioning a tab element proximate to a geometrically determined heat center within the battery cell, selecting appropriate dimensions and materials to enhance heat conduction, and considering the cell's geometry to ensure accurate thermal sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard PTC/TCO arrangements are used with conventional tab element placement, then the device complexity is reduced and manufacturing is easier, but the temperature sensing accuracy deteriorates and thermal event detection reliability is compromised
Solution Approach 1:
The patent introduces a tab element as an intermediary thermal conductor positioned between the heat-generating battery cell material and the temperature sensing mechanism. This tab element acts as a thermal bridge, conducting heat from the cell interior to the sensing location, thereby improving temperature measurement accuracy without requiring direct placement of sensitive components within the cell
Solution Approach 2:
The tab element is pre-positioned and thermally coupled to the battery cell material before thermal events occur. By establishing the optimal thermal conduction path in advance through geometric positioning, the system ensures accurate temperature sensing is ready when needed, eliminating the need for complex real-time adjustment mechanisms
2Measurement precision
If the tab element is positioned away from the heat center for ease of manufacture, then the manufacturing precision requirements are reduced, but the thermal conduction efficiency and temperature representation accuracy deteriorate
Solution Approach 1:
The patent optimizes the tab element's geometric parameters (dimensions, shape, material properties) to maximize thermal conduction efficiency. By carefully selecting and adjusting these parameters, the system achieves accurate internal temperature representation while maintaining reasonable manufacturing tolerances, balancing precision requirements with manufacturability
3Reliability
If inappropriate materials are used for the tab element, then the ease of manufacture is improved and material selection is simpler, but the heat conduction capability and thermal sensing reliability deteriorate
Solution Approach 1:
The patent applies the principle of local quality by selecting materials and designing the tab element structure specifically optimized for thermal conduction in the critical region between the battery cell interior and the temperature sensing mechanism. The tab element uses materials with high thermal conductivity properties tailored to this specific thermal transmission function, ensuring reliable heat transfer from the cell material to the sensing point
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 approach improves the accuracy of thermal event detection, preventing cell damage and ensuring reliable operation by accurately conveying heat from the internal cell to the sensing mechanism.
Implementation Method 1
the tab element being thermally coupled to the material and conducting heat generated by the material
Data Source
AI summary
An embodiment provides a battery cell, including: one or more contacts; a material providing output power to a device via the one or more contacts; and a tab element forming a part of a temperature cutoff mechanism; the tab element being thermally coupled to the material and conducting heat generated by the material; and the tab element being positioned proximate to a geometrically determined heat center. Other aspects are described and claimed.