Battery Module Temperature Estimation via Resistance Measurement
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Solution Overview
Problem
Large-capacity batteries used in hybrid electric vehicles require multiple temperature sensors, increasing cost and dimension, and it is difficult to determine module deterioration due to resistance changes over time and environment.
Innovation Solution
A method that measures temperature and resistance in a predetermined battery module using sensors, calculates changes in current and voltage, and estimates battery temperature using a resistance and temperature table to determine module deterioration, minimizing the number of required temperature sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are installed in each battery module, then temperature measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces resistance as an intermediary parameter to indirectly measure temperature. Instead of directly measuring temperature in each module with sensors, the system measures resistance changes (which are easier to obtain from existing current/voltage measurements) and uses these to estimate temperature, thereby reducing the need for multiple temperature sensors while maintaining measurement capability
Solution Approach 2:
The patent replaces the physical temperature sensing mechanism with an electrical measurement approach. By measuring resistance changes through existing current and voltage sensors and using the relationship between resistance and temperature, the system substitutes direct thermal measurement with electrical property measurement, reducing hardware complexity
2Reliability
If resistance monitoring is added to detect battery deterioration, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the existing current and voltage sensors serve multiple functions. These sensors not only monitor battery operation but also enable resistance calculation and temperature estimation, thereby providing deterioration detection capability without adding dedicated monitoring devices
Solution Approach 2:
The system uses its own existing measurement capabilities (current and voltage sensing) to perform additional functions (resistance monitoring and temperature estimation). The battery management system processes its own operational data to detect deterioration, eliminating the need for separate monitoring infrastructure
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 determination of battery deterioration while reducing the number of temperature sensors needed, thereby minimizing cost and complexity.
Implementation Method 1
a temperature of a predetermined module of the modules of a battery is measured at predetermined time intervals by using a temperature sensor mounted in the predetermined module
Implementation Method 2
A resistance of the predetermined module is calculated by using the change of the currents and voltages
Data Source
AI summary
The present invention relates to a temperature estimating method of a battery. A predetermined module of a battery is equipped with a temperature sensor and a current/voltage sensor(s). Whether the battery deteriorates can be determined by using the measured temperature, current, and voltage.