Battery Current Sensing With Temperature-Difference Error Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Temperature differences between an energy storage device and an external terminal cause measurement errors in current measurement and state of charge (SOC) estimation due to the Seebeck effect, leading to inaccurate data and potential erroneous operations.
Innovation Solution
A management apparatus that performs current measurement processing using a measuring resistor, temperature measurement processing, and correction processing to account for temperature differences between the energy storage device and the external terminal, ensuring accurate current measurement and SOC estimation by calculating and applying correction values based on temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measuring resistor is used to measure current, then current measurement is achieved, but measurement accuracy decreases when there is a temperature difference between the energy storage device and external terminal
Solution Approach 1:
The patent introduces temperature sensors as intermediary devices to detect the temperatures at both ends of the measuring resistor. By measuring the temperature difference and using it to correct the voltage signal, the harmful thermal effect is mediated and compensated, thereby maintaining measurement accuracy despite temperature differences between the energy storage device and external terminal.
Solution Approach 2:
The patent implements a feedback mechanism where temperature measurements are continuously monitored and used to calculate correction values that are applied to the current measurement results. This closed-loop feedback system dynamically compensates for temperature-induced errors, ensuring accurate current measurement even when temperature conditions change.
2Measurement precision
If temperature difference correction is implemented, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The management apparatus is designed to perform multiple functions: it not only measures current but also monitors temperature at both ends of the measuring resistor and automatically applies correction calculations. By integrating these multiple functions into a single system, the patent avoids the need for separate correction devices, thereby limiting the increase in device complexity while achieving improved measurement accuracy.
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 effectively suppresses measurement errors caused by temperature differences, enhancing current measurement accuracy and SOC estimation, thereby preventing erroneous operations and ensuring reliable function execution.
Implementation Method 1
The measuring resistor generates a voltage corresponding to the current, and hence the current can be measured by measuring the voltage
Implementation Method 2
When there is a temperature difference between both ends of the measuring resistor, a voltage is generated at both ends of the measuring resistor by the Seebeck effect
Data Source
AI summary
A management apparatus for an energy storage device, which performs current measurement processing for measuring a current of the energy storage device by using a measuring resistor having one side connected to the energy storage device and the other side connected to an external terminal, temperature measurement processing for measuring at least one of a temperature of the energy storage device and a temperature of the external terminal, and correction processing for correcting, when there is a temperature difference between the temperature of the energy storage device and the temperature of the external terminal, a measurement error caused by the temperature difference for a measured current value measured by the current measurement processing, or guarantee processing for guaranteeing a function to be performed in accordance with a measured current value measured by the current measurement processing.