Battery Cell Temperature Sensor Validation Using Internal Resistance
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Solution Overview
Problem
Existing battery systems face challenges in validating temperature sensors, particularly in reducing the number of sensors required while maintaining measurement accuracy, which is crucial for efficient power management and reducing production costs.
Innovation Solution
A method and system for validating temperature sensors integrated into battery systems by determining the internal resistance and state of charge of battery cells, using a lookup table or functional relationship to compare reference temperatures with measured temperatures, and configuring a control unit to assess sensor functionality based on preconfigured thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temperature sensors are used to ensure measurement accuracy, then measurement precision is improved, but device complexity and production costs increase
Solution Approach 1:
The battery cell itself serves as the reference for validating the temperature sensor by providing electrical parameters (internal resistance, state of charge) that can be independently determined through electrochemical measurements. This self-validation mechanism eliminates the need for separate reference temperature sensors, reducing sensor quantity while maintaining measurement accuracy through cross-validation of electrical and thermal parameters
Solution Approach 2:
The patent introduces an intermediary validation process that uses electrical measurements (voltage, current, internal resistance) as a mediator to indirectly verify temperature sensor accuracy. Instead of directly comparing multiple temperature readings, the system uses the well-established relationship between electrical parameters and temperature to validate the sensor through an intermediate electrical measurement pathway
2Reliability
If multiple temperature sensors are deployed to validate sensor functionality, then reliability is improved, but production costs increase
Solution Approach 1:
The battery cell's electrical characteristics serve as a built-in validation reference that is already present and measurable through normal battery management operations. This self-service approach to validation eliminates the need for additional expensive reference sensors, achieving reliable sensor validation without increasing production costs
Solution Approach 2:
The system establishes a feedback loop where temperature sensor readings are continuously validated against reference temperatures derived from electrical measurements. This feedback mechanism provides ongoing reliability verification using existing sensors and measurements, avoiding the need for additional validation hardware while maintaining high reliability
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 allows for a reduction in the number of sensors needed, enhances measurement accuracy, and improves power management by validating temperature sensors effectively, thereby ensuring reliable battery performance and reducing production costs.
Implementation Method 1
a temperature sensor in thermal contact with the battery cell
Implementation Method 2
enable charging and discharging of the battery via an electrochemical reaction of the positive electrode, the negative electrode, and the electrolyte solution
Data Source
AI summary
A method and a system for validating a temperature sensor integrated into a battery system are disclosed. In one aspect, the method includes determining an internal resistance of at least one battery cell in thermal contact with the temperature sensor and determining a state of charge (SOC) of the at least one battery cell. The method also includes determining at least one reference temperature from a lookup table (LUT) or a functional relationship connecting the internal resistance, the SOC, and a temperature of a reference battery cell. The method further includes comparing the at least one reference temperature with at least one temperature measurement of the temperature sensor to determine a difference therebetween. The method additionally includes validating the temperature sensor based on whether the difference exceeds a preconfigured threshold.