Coil Resistance Battery Temperature Sensing for Charging Control
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 utilizing a coil proximate to the battery, where the coil's direct current resistance is monitored to estimate the battery temperature, and a power management system controls power delivery based on the coil's temperature, allowing for more accurate temperature measurement and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a localized temperature sensor (NTC thermistor) is placed adjacent to the battery cell tabs, then the sensor can be easily installed for manufacturing and assembly, but the temperature measurement is only rough and does not reflect the entire battery temperature distribution
Solution Approach 1:
The patent introduces a coil as an intermediary element that thermally couples to the battery. The coil serves as a mediator between the battery and the temperature measurement system, allowing temperature sensing without direct contact with the battery tabs. This resolves the contradiction by providing accurate temperature measurement through thermal conduction from the battery to the coil, while maintaining manufacturing ease as the coil can be positioned near the battery without complex installation requirements
Solution Approach 2:
The patent replaces the traditional direct-contact mechanical temperature sensor (NTC thermistor attached to tabs) with a coil-based thermal coupling system. This substitution allows temperature measurement through thermal conduction via the coil rather than direct electrical contact, improving measurement accuracy across the battery while maintaining ease of installation
2Measurement precision
If multiple temperature sensors are distributed across the entire battery, then comprehensive temperature measurement is achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent makes the coil serve multiple functions: it acts as both the wireless power transfer component and the temperature sensing element. By thermally coupling the coil to the battery, the same component used for power reception also provides temperature measurement, eliminating the need for separate temperature sensors and reducing overall system complexity
Solution Approach 2:
The patent merges the temperature sensing function with the wireless power receiving coil. Instead of using separate components for power reception and temperature sensing, the coil is designed to perform both functions simultaneously through thermal coupling to the battery, thereby reducing device complexity while maintaining comprehensive temperature measurement capability
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 and temperature regulation, reducing the limitations of traditional localized sensing methods.
Implementation Method 1
monitor a direct current resistance of the coil and estimate a temperature of the coil based on the direct current resistance
Implementation Method 2
a coil located proximate to the battery such that a temperature of the coil is indicative of a temperature of the battery
Data Source
AI summary
A system and method may include a battery, at least one component electrically coupled to and powered from the battery, a coil located proximate to the battery such that a temperature of the coil is indicative of a temperature of the battery, a coil resistance and battery 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, and a power management system communicatively coupled to the coil resistance and battery temperature reporting system, the battery, and the at least one component and configured to control power delivered and consumed by the battery and the at least one component based on the temperature of the coil.