Onboard EV Battery Tester Using Hall Effect Sensors
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Solution Overview
Problem
Existing battery testing techniques for electric vehicles are difficult to implement, especially in hybrid systems, due to accessibility issues and safety concerns with high voltages, and they struggle to accurately assess the health of batteries as they age, affecting energy storage and delivery capabilities.
Innovation Solution
A test device that monitors current flow and voltage in the battery pack of an electric vehicle during braking and acceleration cycles, using non-intrusive sensors like Hall effect sensors, and couples with the vehicle's onboard diagnostics system to provide diagnostic outputs based on baseline data, allowing for safe and efficient testing without disconnecting the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional battery testing techniques are used on electric vehicles, then battery health can be assessed, but safety risks increase due to high voltage exposure and accessibility difficulties
Solution Approach 1:
The patent introduces an onboard diagnostics system as an intermediary between the battery and external testing equipment. This system includes voltage sensors, current sensors, and a microprocessor that safely interface with high-voltage battery components, allowing accurate health assessment without direct exposure to dangerous voltages. The diagnostics system acts as a protected mediator that translates battery status into safe, analyzable data.
2Object-affected harmful factors
If non-intrusive sensing methods are used to monitor battery parameters, then safety is improved, but measurement precision may be compromised
Solution Approach 1:
The patent replaces traditional mechanical connection methods with electronic sensing fields. Hall effect sensors and voltage dividers use electromagnetic fields rather than direct physical contact with high-voltage terminals. This substitution maintains measurement precision while inherently providing electrical isolation and safety, as the sensing mechanisms detect parameters through field interactions rather than conductive connections.
3Measurement precision
If comprehensive battery testing is performed on hybrid systems, then diagnostic accuracy improves, but device complexity and labor requirements increase
Solution Approach 1:
The patent designs the onboard diagnostics system to perform multiple functions through a single integrated architecture. The microprocessor controls voltage sensing, current sensing, data processing, and communication functions. This multi-functional approach enables comprehensive battery health assessment without requiring separate dedicated equipment for each measurement type, thereby reducing overall system complexity while maintaining diagnostic 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
Enables effective assessment of battery health and energy storage capabilities, providing a relative comparison to new vehicle conditions, thereby identifying battery degradation and optimizing energy recovery and delivery, while ensuring safety and reducing labor-intensive testing processes.
Implementation Method 1
using non-intrusive sensors like Hall effect sensors
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.