Non-Intrusive EV Battery Testing via OBDII Interface
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Solution Overview
Problem
Testing electrical systems in electric vehicles is challenging due to the difficulty in accessing individual batteries within a battery pack and safety concerns with high voltages, making traditional battery testing techniques impractical.
Innovation Solution
A test device that monitors current flow and voltage in the battery pack using sensors like Hall effect sensors, which can be placed in line with the battery pack or coupled through an OBDII interface, allowing for non-intrusive testing without disassembly, and provides diagnostic outputs based on comparison to baseline data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional battery testing techniques are used, then direct measurement of battery parameters is possible, but safety risks increase due to high voltage exposure and device complexity increases due to disassembly requirements
Solution Approach 1:
The patent introduces an OBDII interface as an intermediary between the test device and the battery pack. This interface allows indirect measurement of battery parameters through electrical connections already present in the vehicle, eliminating the need for direct high-voltage connections to individual batteries. The intermediary approach maintains measurement capability while isolating the operator from harmful high voltages.
Solution Approach 2:
The patent replaces mechanical disassembly of battery packs with electronic/digital measurement methods through the OBDII interface. Instead of physically accessing and connecting to individual batteries, the system uses electronic signal transmission through existing vehicle communication bus, substituting mechanical intervention with electronic measurement techniques that are inherently safer.
2Difficulty of detecting and measuring
If battery packs are disassembled for testing, then individual battery access is possible, but testing time increases and reliability decreases due to potential damage
Solution Approach 1:
The OBDII interface serves as a mediator that provides access to individual battery parameters without requiring physical access to the batteries. The interface taps into existing vehicle electrical systems and communication protocols, allowing remote measurement of battery voltage, current, and other parameters through software communication rather than physical disassembly.
Solution Approach 2:
The test device is designed to work through the universal OBDII interface that is already present in modern vehicles. This multi-functional approach allows the same interface to provide access to multiple battery parameters (voltage, current, temperature, state of charge) simultaneously, eliminating the need for separate measurement devices or disassembly procedures for each parameter.
3Ease of operation
If non-intrusive testing methods are used, then safety and testing time are improved, but measurement precision may be compromised
Solution Approach 1:
The system continuously monitors battery parameters through the OBDII interface and provides real-time feedback on battery health, state of charge, and performance metrics. The feedback mechanism allows for dynamic adjustment of measurement parameters and provides comprehensive diagnostic information that compensates for the indirect measurement approach, maintaining high measurement precision while preserving safety.
Solution Approach 2:
The patent replaces direct electrical connections with electronic signal transmission through the vehicle's existing communication systems. This substitution uses digital signal processing and software-based measurement techniques that can achieve high precision by filtering, averaging, and compensating for noise in the electrical signals, thereby maintaining measurement accuracy without requiring physical battery access.
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
Enables efficient and safe testing of electric vehicle batteries by assessing their energy storage and delivery capabilities, indicating their health and efficiency relative to new batteries, without requiring physical disassembly or direct high-voltage connections.
Implementation Method 1
A current sensor such as a Hall effect sensor can be placed in line with the battery pack
Data Source
AI summary
Testing or diagnostics are performed on an electric vehicle. The vehicle is operated and current flow through a system of the vehicle is monitored. A voltage related to the system is also monitored. Diagnostics are provided based upon the monitored voltage and the monitored current.