Battery Voltage Measurement Correction for Temperature and Strain Drift
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery cell voltage monitoring in electric vehicles faces accuracy variations due to environmental conditions such as temperature and mechanical strain, which existing technologies struggle to accurately correct for, leading to performance inconsistencies.
Innovation Solution
An electronic device with an analog-to-digital converter (ADC), multiplexer, voltage reference circuit, and digital circuit that includes strain sensors and a temperature sensor, which corrects battery voltage values using common mode, temperature, and strain correction parameters and equations to provide accurate voltage measurements across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage sensing and digital conversion circuitry is used for battery cell voltage monitoring, then voltage measurement capability is provided, but measurement accuracy varies at different environmental conditions
Solution Approach 1:
The patent replaces complex analog compensation circuits with digital correction algorithms. Strain sensors and temperature sensors provide environmental data that is processed digitally to generate correction parameters, which are then applied to correct the ADC output voltage measurements. This digital approach provides consistent accuracy across varying environmental conditions without requiring complex analog circuitry adaptation.
Solution Approach 2:
The patent implements feedback through strain sensors and temperature sensors that continuously monitor environmental conditions affecting the voltage reference circuit. These sensors provide feedback signals that are used to dynamically adjust correction parameters in real-time, ensuring accurate voltage measurements despite changes in mechanical strain or temperature during battery operation.
2Measurement precision
If correction parameters are stored and applied digitally, then voltage measurement accuracy is improved across environmental conditions, but device complexity increases
Solution Approach 1:
The patent substitutes complex analog compensation circuits with a digital correction system. Instead of using additional analog components to compensate for environmental effects, the system uses strain sensors, temperature sensors, and digital algorithms to achieve the same correction function. This reduces analog circuit complexity while maintaining or improving measurement accuracy.
Solution Approach 2:
The patent creates digital models of the environmental effects on the voltage reference circuit through correction parameters stored in memory. These digital correction models replicate the compensation function that would otherwise require complex analog circuits, allowing accurate correction through simple digital arithmetic operations on the ADC output.
3Adaptability or versatility
If strain sensors and temperature sensors are added to the voltage reference circuit, then environmental condition correction capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent makes the ADC and digital processing circuitry multi-functional by having them perform both the primary voltage measurement function and the environmental correction function. The same digital circuit that converts the voltage signal also processes sensor data and applies corrections, eliminating the need for separate dedicated correction circuits and simplifying manufacturing.
Solution Approach 2:
The patent merges the voltage sensing function with environmental monitoring and correction functions into a single integrated measurement system. The strain sensors, temperature sensors, ADC, and correction algorithms work together as one unified system rather than separate components, reducing manufacturing steps and assembly complexity.
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
The solution effectively removes temperature curvature and corrects for common mode and strain-related errors, ensuring accurate battery voltage measurements within a specified accuracy range, enhancing the reliability of battery monitoring and management systems.
Implementation Method 1
monitoring digital outputs of an analog strain gauge to continuously detect strain seen by the on-chip voltage reference
Implementation Method 2
temperature correction parameters determined during wafer probe testing based on measured junction temperature
Implementation Method 3
analog to digital converter (ADC)... converting the output of the bandgap to a digital output
Implementation Method 4
converting the output of the bandgap to a digital output... flattening the curvature of the bandgap reference versus temperature
Data Source
AI summary
An electronic device includes an ADC, a multiplexer, a voltage reference circuit, an analog circuit, and a digital circuit. The ADC has a signal input, a reference input, and an output. The multiplexer has signal inputs and a signal output coupled to the signal input of the ADC. The voltage reference circuit has an output coupled to the reference input of the ADC, a first strain sensor coupled to a first signal input of the multiplexer, a second strain sensor coupled to a second signal input of the multiplexer, and a temperature sensor. The analog circuit has an input coupled to a battery, and an output coupled to a fourth signal input of the multiplexer. The digital circuit is coupled to the output of the ADC and stores correction parameters for correcting a converted battery voltage value from the ADC.