The cycle life, charge-discharge performance, and safety performance of lithium-ion batteries have a great correlation with battery cell temperature. Therefore, for lithium-ion battery packs, the importance of thermal management systems is unquestionable. However, the first step in designing a lithium-ion battery thermal management system requires accurate knowledge of the battery cell heat genera...
Battery life includes cycle life and calendar life. Generally speaking, battery life is a performance indicator based on cycle life. The battery cycle life test is performed by a battery cycle life tester, and the cycle life is evaluated by simulating the actual working conditions of the battery to obtain various performance indicators after a certain number of cycles. The performance indicators o...
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...
EV battery power and internal resistance testing is mainly to test the available power and DC internal resistance of the battery system under different temperature environments. The relevant test standards are ISO 12405 and FreedomCAR. 1.Overview of testing under ISO 12405 ISO 12405 specifies that the power test and DC internal resistance test should be conducted at normal temperature, high temper...
The method of battery energy efficiency testing is different for different application scenarios. For high power application scenarios, battery energy efficiency testing will focus on verifying the recovery and utilization of high-rate regenerative energy by the EV battery system. For high-energy application scenarios, battery energy efficiency testing will focus on verifying the charging performa...
The EV battery system start-up capability testing is mainly to verify the EV battery system start-up output power at low temperature and low SOC. The brief method of EV battery system start-up capability testing is as follows: perform a constant voltage discharge with a maximum current limit based on the maximum pulse discharge current specified by the battery cell manufacturer and collect the vol...