The test system generates control voltages in a battery model to simulate temperature conditions to the battery management systems for evaluating the temperature management of the BMS.
The lifespan of a battery in an electric vehicle is significantly affected by the quality of the battery management system (BMS).
In each individual battery cell, parameters such as charge/discharge current, voltage, and temperature are monitored. It is especially important to understand how the BMS responds to changes in the temperature seen within each individual cell.
Evaluating BMS performance by placing a battery pack in a climate chamber to subject it to the entire temperature range is costly and takes considerable time. Because of this, temperature changes are often simulated. Testing systems generate control voltages in a battery model that help to evaluate the temperature management of the BMS. These systems are typically exposed to high DC voltages, as the battery and its management system work within vehicle environments where voltages are in excess of 800 V DC… and continue to climb based on advancements in technology.
Requirements of Application
It is important to have accuracy and safety with voltage signal conversions necessary to bring simulated temperature conditions to the battery management systems.
It is also helpful to have flexibility with input and output selection, as changes in testing scenarios could create the need for modifications to the ranging or with the types of signals themselves. Flexibility also brings with it the possibility of standardization on a single solution for multiple conditioning and isolation applications seen within testing environments.
The Knick P41000 can convert standard control signals from input to output, while keeping all channels electrically isolated from each other, up to 1650 V DC. T90 response time is rated at 110 μs, and the device contains a cutoff frequency specification of 5 kHz. Flexibility is achieved by way of calibrated switching of up to 16 input/output ranges, which can be user defined.