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sales@dewetron.com.cn
Will our mobility in future be constrained by the currently high emissions or is there a different and better way to get from A to B as fast and comfortably as possible? Electric power systems seem to be the answer, whether combined with combustion engines in hybrid vehicles or purely in electrical vehicles. Nowadays, batteries are a very important component of electric or hybrid vehicles. The electric car is going to win the customer’s acceptance as soon as a battery type is available that is cost effective and reliable for ten years. |
We can realize a remarkable progress in the development of batteries and that is why there is an increased demand for testing and measuring those types in multiple operation modes like driving, charging and misuse as well as idle. Singular cells or complete battery systems as well as whole vehicles including drivetrain (hybrid or electric vehicles) are measured.
Exactly for these tasks mixed signal data acquisition systems by DEWETRON are in use at the AIT Austrian Institute of Technology.
The following measurements are carried out:
n Characterization of cells in different load profiles and at different temperature
n Long-term performance and ageing testing
n Inspection of module and system regarding the complete battery system and battery management
n Checking misuse such as overloading, short-circuit, mechanical damage, overheating
n The tests are carried out on the test bench as well as in real driving.
Think of testing a vehicle. You would like to fix some sensors such as acceleration sensors, thermal elements, and rotation speed and so on by yourself. Additionally, one or some hundred parameters should be recorded via CAN-bus. And a GPS sensor should register the position, the exact speed, distance, direction, etc. And why should not a camera film the driver or the battery system? With this we have analog sensors, digital communication bus data, serial GPS information and video images. All these sources have their individual time system and are registered with their particular sampling rate. Our systems can record asynchronous input channels with different time resolutions SYNCHRONOUSLY (one clock for all channels!).
DEWESoft is the user friendly application software on all our test and measurement instruments and solutions. DEWESoft is the connection to the hardware, the interfaces, signal amplifiers, A/D converter boards and so on. It offers unequalled control of sampling (with different operation modes) and visualizations (screen view). The data processing is already simplified during the measurement process by applying mathematical formula, which speeds up the later analysis. Many export filters make the subsequent data analysis and documentation in other programs possible. A programming interface provides the possibility to expand your DEWETRON system according to your individual needs.
An extra library for power measurement (DEWESoft POWER Module) makes the calculation of for example power flow, losses, harmonics and voltage fluctuations possible. With the help of this functionality the user can, beside the DC measurement on batteries, make time synchronous analysis of the other drive components like converters and motors. All this together makes a total view on the system “E-drive” and its losses very simple and has also a very high accuracy.
For each measurement the sensor settings are saved together with the other test parameters in the measurement data. This allows a smooth and complete processing of the measured data as well as a comparable and re-traceable repetition of tests.
Analyses typical for batteries such as HPPC (Hybrid Pulse Power Characterization) can be done online as well as offline.
Having a defined load profile thermal analysis for monitoring the heating-up and temperature distribution of the battery can be done with the help of synchronous infrared videos.
In misuse-tests that lead to exploding and out gassing of the battery the current and voltage curves can be recorded time-synchronously with the help of video and audio signals. Thus the moment of damage can be synchronized with the electrical parameters.
Test bench connection: For test sequences a central administration of the test results is mandatory in order to receive statistical analyses such as scattering of parameters in one test. The data basis offers the possibility to derivate a mathematical model from an accumulation of parameters. Batteries can furthermore be simulated mathematically. This reduces the required number of prototypes. Via its DCOM-interfaces DEWETRON offers the possibility to link to these test benches flexibly and individually.