Vehicle Battery Temperature Estimation After Sensor Failure
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Solution Overview
Problem
Conventional battery management systems (BMS) fail to limit battery discharge effectively when a temperature sensor disconnects, leading to accelerated battery deterioration due to incorrect temperature readings.
Innovation Solution
A device and method that utilize big data to estimate the temperature at a failed temperature sensor by calculating the average difference between highest and lowest temperatures and identifying the most frequent temperature sensor measurements, allowing the controller to manage battery discharge based on these estimates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BMS uses temperature readings from remaining functional sensors when a sensor fails, then the system continues to operate without additional hardware, but the temperature measurement becomes inaccurate leading to incorrect discharge limiting decisions
Solution Approach 1:
The patent introduces a data server as an intermediary that collects, stores, and processes temperature data from multiple vehicles. This external database serves as a mediator between the failed sensor and the BMS, providing reference temperature information that compensates for the missing sensor reading and enables accurate discharge limiting decisions.
Solution Approach 2:
The patent uses temperature data from other vehicles (copies of temperature information) to replace the missing temperature reading from the failed sensor. By copying temperature patterns and characteristics from functioning sensors in similar operational conditions, the system reconstructs the missing temperature information without requiring additional hardware sensors.
2Device complexity
If the BMS limits discharge based on incorrect temperature readings from failed sensors, then the system maintains simple control logic, but battery deterioration accelerates due to improper discharge management
Solution Approach 1:
The patent implements preliminary action by pre-collecting and storing temperature data from multiple vehicles in a database before any sensor failure occurs. This advance preparation creates a reference library of temperature patterns that can be quickly queried and applied when a sensor fails, enabling accurate discharge limiting without complex real-time analysis or additional sensors.
3Measurement precision
If multiple temperature sensors are installed at different battery locations, then the system achieves better temperature coverage, but the complexity of sensor management and failure detection increases
Solution Approach 1:
The patent merges temperature data from multiple sources (multiple sensors within a vehicle and multiple vehicles from the database) into a unified temperature assessment. By combining these data streams and using statistical analysis, the system achieves comprehensive temperature monitoring while simplifying failure detection, as the database provides reference patterns for identifying sensor anomalies.
Data Source
AI summary
A device and a method for managing batteries of a vehicle are disclosed. The device may include: batteries arranged in a vehicle, a plurality of temperature sensors mounted at different locations of the batteries, and a controller that, when a failure occurs at an arbitrary temperature sensor among the plurality of temperature sensors, estimates a temperature value at the failed temperature sensor using big data, and controls discharge of the batteries based on the estimated temperature value.