Feature: Batteries
contains information such as capacity, cutoff voltage, internal resistance and voltage tied to the battery SoC. Tis type of soſtware includes predefined battery models that engineers can use directly in the test. Aſter loading
the selected battery model, the soſtware automatically displays all the information; see Figure 2 for battery emulation test at 98.1% SoC. Engineers can
further modify the settings, such as battery capacity rating, current limit, or initial SoC. Maintaining precise control over the battery’s SoC is paramount in e-mobility battery safety testing. Te vehicle’s battery management system (BMS) must undergo comprehensive testing to ensure its readiness to handle over-discharge or over-charge scenarios. In such situations, the BMS must be able to promptly halt the charging or discharging operation, to safeguard the battery. If an engineer opts to use a cell battery model for this test, the
advanced battery emulation and test soſtware can activate the multi-cell battery pack features. Tis allows engineers to configure the cells’ series and parallel arrangements, effectively simulating a battery pack’s higher voltage and current outputs. Additionally, users can set the test’s cutoff condition by defining the target SoC or terminal voltage. Finally, engineers must analyse battery charging and
discharging to ensure the battery performs at its peak capabilities. Analysing battery ageing – which harms vehicle range, charging frequency and performance – is also crucial. Features like cycler operation modes enable engineers to create a custom sequence of charging, resting and discharging a battery up to 1,000 cycles of operations, to measure battery performance and capacity degradation over time; see Figure 3. Te test shows a new cycle sequence consisting of a constant
Figure 3: An advanced emulation and test software running cycler operation mode settings with the completed test result
10A current discharge – discharge, rest, charge, rest operation – with ten repetitive cycles. Te cycle sequence accelerates the ageing battery test for a quick feature demonstration. For more accurate results in the battery ageing test, engineers can further discharge the battery to a much lower voltage, add more charge/discharge/ rest sequences per cycle, increase the number of cycles, and use the dynamic discharge current data. Users can also define the cutoff condition to automatically stop the cycler operation mode when capacity reaches a certain level of loss.
E-mobility vehicle performance In e-mobility vehicles, accurate battery performance measurements are critical to ensure the battery in the low-power vehicle performs as expected. Engineers using advanced battery solutions and soſtware that provides the correct data will better understand battery performance. Errors in the data can negatively impact battery performance and decrease a battery’s potential. As e-mobility vehicles have a lot of electronic components and features, engineers need to ensure that their batteries deliver the best potential. An incorrect battery measurement solution can significantly impact the performance of e-mobility vehicles.
www.electronicsworld.co.uk April 2024 21
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