Battery Temperature Estimation via Complex Impedance Slope
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Solution Overview
Problem
Existing temperature estimating apparatus for batteries require complex arithmetic operations and may not accurately measure battery temperature without temperature sensors, especially in varying internal temperature conditions.
Innovation Solution
A temperature estimating apparatus that derives a slope function from complex impedance values at different temperatures, allowing for the estimation of battery temperature using a simple linear relation between complex impedance and inverse temperature, without the need for temperature sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors (e.g., thermocouples) are used to measure battery temperature, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces physical temperature sensors (mechanical/thermal measurement systems) with an electrical measurement system that uses complex impedance measurements to infer temperature. The estimating apparatus measures battery temperature indirectly through electrical properties (complex impedance at predetermined frequencies) rather than direct thermal contact, thereby eliminating the need for temperature sensors while maintaining measurement capability.
2Measurement precision
If complex arithmetic operations are used to estimate battery temperature from impedance data, then temperature estimation capability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent transforms the temperature estimation problem by changing the measurement parameter from direct temperature sensing to complex impedance measurement. By measuring complex impedance at predetermined frequencies and using the relationship between impedance and temperature, the system achieves temperature estimation through simpler electrical measurements rather than complex thermal arithmetic operations.
Solution Approach 2:
The patent introduces complex impedance as an intermediary parameter that connects electrical measurements to temperature information. Instead of directly measuring temperature or performing complex thermal calculations, the system measures complex impedance (which varies with temperature) and uses this intermediate electrical property to infer temperature, simplifying the overall measurement process.
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
Enables accurate and easy temperature estimation of batteries, reducing the complexity and cost of the apparatus, and allowing for easier integration in limited spaces, such as within vehicles.
Implementation Method 1
a deriving device configured to derive a slope function, on the basis of a value of a complex impedance of a battery at a predetermined frequency out of values obtained at a plurality of different temperatures and on the basis of a temperature of the battery when the complex impedance is obtained
Data Source
AI summary
A temperature estimating apparatus is provided with: a deriving device configured to derive a slope function, on the basis of a value of a complex impedance of a battery at a predetermined frequency out of values obtained at a plurality of different temperatures and on the basis of a temperature of the battery when the complex impedance is obtained, wherein the slope function indicates a relation between the value of the complex impedance at the predetermined frequency and an inverse of the temperature of the battery; and an estimator configured (i) to measure a value of the complex impedance at the predetermined frequency and (ii) to substitute the measured value of the complex impedance at the predetermined frequency into the slope function, thereby estimating a temperature of the battery when the value of the complex impedance is measured.