The basis of battery cell selection is a systematic and comprehensive test and evaluation of the cells. It mainly evaluates whether it meets the application requirements of lithium-ion battery systems from the aspects of cell consistency, temperature characteristics, rate characteristics, pulse power performance, cycle life performance and safety performance. There are many test items for battery ...
Driving range is the main performance indicator of an EV, and this is mainly determined by the available capacity of the EV battery system. Lithium-ion batteries are highly sensitive to temperature and current rate. By analyzing the charge-discharge curve of the battery under different working conditions, and analyzing its charge-discharge capacity and energy and other parameters, the battery's su...
The constant-power discharge performance of lithium-ion battery cells is another feature to focus on. Because this determines the ability of the battery system to stabilize the output power, which in turn affects the vehicle performance of the EV. The following table is the main test steps for the constant power discharge test of battery cells at different temperatures and different powers. The ba...
Power characteristics are an important performance indicator of EVs, as well as an important indicator of EV battery cells. HPPC test, short for Hybrid Pulse Power Characterization Test, refers to the test of discharging and feedback (charging) pulses within the range of current and voltage available to the battery to characterize the dynamic power capability of the battery. The main purpose of th...
The battery cell energy efficiency refers to the percentage of the discharge energy to the charging energy in the battery charge-discharge cycle under given conditions. Generally speaking, charging and discharging cycle tests are performed on battery cells under different temperature conditions, so as to obtain the energy efficiency of the battery cells. The following table is a simple battery cel...
Lithium-ion batteries are used in many scenarios, and there is no shortage of complex, changing and harsh environments. For example, some batteries need to operate over an extremely wide temperature range, some need to operate under sustained vibration, some need to operate under high-rate charge/discharge conditions, etc. However, Li-ion battery is a hermetically sealed body containing both oxidi...
The system function testing of EV batteries is mainly to verify the basic function and acquisition test of electric vehicle battery system. The electric vehicle battery system must be able to measure and monitor important parameters such as the voltage of the EV battery pack, the voltage of the minimum monitoring units, the system operating current, the system temperature, the insulation resistanc...
The electrical performance test of EV batteries mainly includes capacity and energy test, power and internal resistance test, energy efficiency test, start-up test, self-discharge test, charging test, cycle life test, etc. EV battery capacity and energy testing focuses on the available capacity and energy of EV battery systems under different conditions. The main influences on the capacity and ene...