Battery Coil Resistance Sensing for Accurate Temperature Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery temperature sensing methods, such as using negative temperature coefficient (NTC) thermistors, provide only rough estimates of battery temperature due to their localized placement, failing to account for temperature conditions across the entire battery, which can affect charging performance.
Innovation Solution
A system that includes a coil proximate to the battery, with a coil resistance and temperature reporting system to monitor direct current resistance and estimate battery temperature, and a power management system to control power delivery based on the coil temperature, allowing for more accurate temperature measurement and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a localized temperature sensor (NTC thermistor) is placed adjacent to the battery cell, then the sensor can be easily manufactured and assembled, but it only provides rough estimation of average battery temperature and does not measure temperature conditions across the entire cell
Solution Approach 1:
The coil serves dual functions: wireless power transfer and temperature sensing. By monitoring the coil's own resistance changes with temperature, the system eliminates the need for separate temperature sensors, achieving comprehensive temperature measurement while reducing device complexity
Solution Approach 2:
The existing coil component used for wireless power transfer is made multi-functional by utilizing its temperature-dependent resistance property for temperature sensing, allowing one component to perform multiple functions without additional hardware
2Ease of manufacture
If a localized temperature sensor is placed near battery cell tabs for manufacturing ease, then assembly is simplified, but temperature hot spots and non-uniform temperature distribution across the battery cannot be detected
Solution Approach 1:
The coil positioned near the battery serves itself by having its resistance changes directly reflect the battery's temperature conditions, providing reliable temperature monitoring without requiring multiple sensors strategically placed throughout the battery structure
Solution Approach 2:
The coil acts as an intermediary element that transfers both wireless power to the battery and thermal information from the battery environment, converting temperature data into resistance signals for monitoring
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 provides a more accurate and comprehensive temperature measurement of the battery, enabling improved charging performance by ensuring the battery is maintained within an optimal temperature range, thus enhancing charging speed, efficiency, and battery life.
Implementation Method 1
monitor a direct current resistance of the coil and estimate a temperature of the coil based on the direct current resistance
Data Source
AI summary
A system and method may include a coil and a coil resistance and temperature reporting system electrically coupled to the coil and configured to monitor a direct current resistance of the coil and estimate a temperature of the coil based on the direct current resistance.