Battery Sensing Module Temperature Sensor Selective Disconnect
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Solution Overview
Problem
Current battery state monitoring systems in automotive applications face challenges in accurately measuring temperature across battery cells due to potential overvoltage issues, which can lead to inaccurate data and potential damage from injection currents.
Innovation Solution
A traction battery system with a battery pack sensing module that includes a temperature sensor, an integrated circuit with selectable test currents, and a field-effect transistor switch to disconnect the sensor input when voltage exceeds a predefined value, ensuring accurate temperature measurement and protection against overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is connected to an integrated circuit for continuous monitoring, then temperature data can be obtained for battery management, but overvoltage conditions can cause inaccurate measurements and potential damage to the circuit
Solution Approach 1:
The patent applies preliminary action by implementing a protective mechanism that activates before overvoltage can damage the integrated circuit. The circuit monitors voltage levels and preemptively disconnects the temperature sensor when overvoltage conditions are detected, preventing harmful effects before they occur.
Solution Approach 2:
The patent uses an intermediary protective circuit element (such as a diode or transistor) positioned between the temperature sensor and the integrated circuit. This intermediary component blocks excessive voltage from reaching the sensitive integrated circuit while allowing normal operating voltages to pass through, thus mediating the interaction between the sensor and the circuit.
2Measurement precision
If test current is applied to the temperature sensor for calibration, then measurement accuracy can be improved, but excessive current can cause overvoltage and damage the sensor
Solution Approach 1:
The patent implements feedback control by continuously monitoring the voltage across the temperature sensor during test current application. When the voltage approaches dangerous levels, the circuit automatically reduces or stops the test current, ensuring accurate calibration without causing damage through excessive current injection.
Solution Approach 2:
The patent applies dynamics by making the test current adjustable and controllable rather than fixed. The circuit dynamically adjusts the test current level based on real-time voltage measurements, allowing optimal current for calibration while preventing excessive current that would cause overvoltage and sensor damage.
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 solution enhances the accuracy of battery state monitoring by optimizing signal-to-noise ratio and protecting the system from overvoltage conditions, thereby improving the reliability of battery management strategies.
Implementation Method 1
a field effect transistor connected between the temperature sensor input and the integrated circuit, and having a gate that selectively opens based on a voltage on the temperature sensor input
Implementation Method 2
a temperature sensor that senses temperature of at least some of the battery cells
Data Source
AI summary
A battery pack sensing module includes a temperature sensor input connected with a battery cell temperature sensor, an integrated circuit, and a field effect transistor connected between the temperature sensor input and the integrated circuit, and having a gate that selectively opens based on a voltage on the temperature sensor input.