Surface Temperature Sensor Layout for Electrical Hot-Spot Detection
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Solution Overview
Problem
Electrical devices often experience excessive heat production due to faults or extended operation, which can lead to user injury, device damage, and in severe cases, fires, particularly in rechargeable batteries where high temperatures reduce lifespan and risk thermal run-away.
Innovation Solution
An electrical device with a surface-covered temperature sensor comprising first and second electrodes separated by a control material whose electrical conductivity increases with temperature, allowing current flow once a predetermined temperature is reached, enabling hot-spot detection and potentially triggering control measures to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional temperature sensors are used, then temperature monitoring is limited to specific points, but hot-spots at any position on the surface cannot be detected
Solution Approach 1:
The temperature sensor is segmented into multiple sensing elements arranged in a matrix pattern across the surface. Each sensing element independently monitors temperature at its location, enabling comprehensive coverage of the entire surface area rather than relying on a single point sensor.
Solution Approach 2:
Multiple temperature sensing elements are merged into a single integrated sensor assembly that covers the entire surface. This combines the functionality of numerous discrete sensors into one unified component, achieving full surface monitoring without proportionally increasing device complexity.
2Reliability
If temperature monitoring is extended to cover the entire surface, then hot-spot detection capability is improved, but the complexity and cost of the sensing system increases
Solution Approach 1:
The temperature sensor serves multiple functions simultaneously: it monitors temperature across the entire surface, detects hot-spots at any position, and provides data for both preventive and corrective control actions. This multi-functionality justifies the integrated design and reduces the need for separate monitoring systems.
Solution Approach 2:
The sensor system changes its monitoring parameters dynamically based on operating conditions. It continuously adjusts the temperature thresholds and monitoring intensity according to the device's operational state, enabling reliable hot-spot detection while optimizing resource usage and reducing unnecessary complexity.
3Object-affected harmful factors
If temperature monitoring is implemented, then safety is improved, but the device becomes more complex and expensive
Solution Approach 1:
The temperature sensor provides continuous feedback to the control system, which automatically adjusts operational parameters in response to detected temperature conditions. This closed-loop feedback mechanism enables preventive control actions that enhance safety while maintaining manageable system complexity through automated responses.
Solution Approach 2:
The system incorporates self-service capabilities where the control system automatically interprets sensor data and executes appropriate control actions without requiring external intervention. The sensor and controller work together as an integrated safety system that autonomously manages temperature monitoring and response.
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 solution effectively detects hot-spots across the entire surface of electrical devices, allowing for timely intervention to prevent damage and safety hazards, while also extending the lifespan of secondary batteries by managing temperature effectively.
Implementation Method 1
the material properties and/or configuration of the control material is such that the electrical conductivity of the control material increases with increasing temperature
Data Source
AI summary
An electrical device including a surface which may be exposed to heat derived from operation of the electrical device such that the temperature of the surface increases during operation. The surface includes a temperature sensor including first and second electrodes separated by a layer of control material. The material properties and/or configuration of the control material are selected such that the electrical conductivity of the control material increases with increasing temperature so that electrical current is able to pass between the first and second electrodes once the temperature of any part of the control material has reached or exceeded a predetermined temperature. The temperature sensor extends over substantially the whole of the surface. A system including the electrical device and a method of controlling the electrical device is also disclosed.