Battery Sensor Measuring Resistor Temperature Compensation
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Solution Overview
Problem
Existing battery sensors face challenges in accurately and reliably determining the temperature of the measurement resistance, leading to inaccuracies in battery parameter measurements due to spatial removal from the vehicle battery and external temperature influences.
Innovation Solution
A procedure for the operation of a battery sensor that determines a correction value for the electrical resistance of the measurement resistance, allowing for precise temperature determination of the measurement resistance without the need for additional temperature sensors, by utilizing the temperature dependence of the correction value and pre-determined connections stored in the evaluation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is mounted on the measuring resistor, then the temperature measurement accuracy is improved, but the assembly complexity increases
Solution Approach 1:
The measuring resistor serves dual purposes: it functions as both the measurement element for current detection and as the temperature sensing element. By utilizing the inherent temperature dependence of the resistor's electrical resistance, the system eliminates the need for a separate temperature sensor, thereby maintaining high measurement accuracy while reducing assembly complexity
Solution Approach 2:
The measuring resistor is designed to perform multiple functions simultaneously: it measures the load current through voltage drop detection and also serves as a temperature sensor by detecting changes in its own electrical resistance that result from temperature variations. This multi-functionality resolves the contradiction by eliminating the need for additional temperature sensing components
2Device complexity
If the temperature sensor is mounted on a circuit board away from the battery, then the assembly complexity is reduced, but the temperature measurement accuracy deteriorates
Solution Approach 1:
The measuring resistor, which is inherently part of the battery sensor assembly and thermally coupled to the battery, serves as the temperature sensing element. This eliminates the need to mount a separate temperature sensor on the circuit board while ensuring accurate temperature measurement directly at the measurement location
Solution Approach 2:
The temperature sensing function is extracted from a separate temperature sensor and integrated into the measuring resistor itself. By using the resistor's own electrical resistance characteristics to indicate temperature, the system removes the need for additional temperature sensing hardware while maintaining measurement accuracy
3Ease of operation
If the temperature sensor is positioned at a distance from the vehicle battery, then the assembly ease is improved, but the temperature measurement reliability deteriorates
Solution Approach 1:
The measuring resistor, which is already positioned close to the battery as part of the battery sensor assembly, serves as the temperature sensor. This eliminates the need to relocate or reposition temperature sensing components while ensuring reliable temperature measurement through direct thermal coupling with the battery
Solution Approach 2:
The temperature sensing function is merged with the existing measuring resistor that is already positioned near the battery for current measurement. This combination maintains the close proximity to the battery for reliable temperature measurement while simplifying assembly by utilizing an existing component rather than adding a separate temperature sensor
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 enables reliable and precise temperature determination of the measurement resistance, minimizing delays and external influences, thereby improving the accuracy of battery parameter measurements.
Implementation Method 1
The electrical resistance of the measuring resistor is dependent, among other things, on temperature. This means that a change in the battery's temperature, which also affects the measuring resistor thermally coupled to the battery, leads to a change in the electrical resistance of the measuring resistor.
Data Source
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AI summary
The invention relates to a method for operating a battery sensor (10), wherein the battery sensor (10) comprises at least one measuring resistor (28, 28a, 28b) and at least one voltage detection device (30, 30a, 30b) for detecting a voltage drop across the measuring resistor (28, 28a, 28b) and for outputting at least one measured value dependent on the detected voltage drop, as well as an evaluation circuit (50), comprising the following steps: - determining a correction value for the measured value by the evaluation circuit (50), and - determining a first temperature value of the measuring resistor (28, 28a, 28b) based on the determined correction value by the evaluation circuit (50). The invention further relates to a battery sensor (10) configured to carry out such a method.