Feature: Batteries
charge rates and temperature management. However, translating these metrics into real-world scenarios presents hurdles, since the dynamic nature of driving and the influence of vehicle weight can be challenging to quantify precisely.
Understanding the ageing battery Further, evaluating the performance of an EV with an ageing battery is crucial, since an aged battery can no longer perform at optimal capacity. Rechargeable batteries such as Lithium-ion (Li- ion) have a limited lifespan and will gradually lose their ability to hold and deliver a charge as they age. Moreover, Li-ion batteries tend to have a finite charge/discharge cycle; their capacity starts to degrade once they meet that limit, further reducing the travel distance of EVs. To accurately determine the many factors that affect battery
power and performance requires an advanced battery test solution, with features like battery cycler test, emulation test, charge/ discharge test, and profiler test.
When measuring battery performance, engineers need
precise and accurate measurements, to take full advantage of battery capacity and optimise all e-mobility vehicle features. Battery measurement solutions must provide advanced results and allow engineers to use features such as profiling and data operation modes to create battery discharge models. Discharge modelling offers critical information like performance prediction, efficiency optimisation and battery health status. One of the advantages of using advanced battery
measurement solutions and soſtware is creating a battery charge/discharge model from the physical battery, with profiler operation modes. A battery charge or discharge model allows engineers to analyse the battery’s performance, including capacity, internal resistance, voltage and current at various temperatures and operational conditions. Te soſtware automatically generates a reusable battery model for the battery emulation test. Engineers can then create a battery discharge model by dynamically and constantly discharging the battery, and providing information about current, power or resistance; see Figure 1. Other advanced features
that measure battery performance for low- power e-mobility vehicles are battery emulation operation modes. Tey help determine how a targeted device under test (DUT) behaves without needing the physical battery. Tis offers a safer test environment whilst saving engineers time, by eliminating the need to charge the physical battery aſter every test. In addition, with emulation operation modes, engineers can accurately and seamlessly run the test on the DUT at a specific battery state of charge (SoC), simply by entering the desired battery SoC in the soſtware.
Figure 2: Example of advanced emulation and test software running an emulation operation mode setting, and the completed test result
20 April 2024
www.electronicsworld.co.uk
Battery models To run an emulation test using advanced battery test and emulation soſtware, engineers need to use a model representing the physical battery. Te model
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