Test Principle and Method: The power battery High Power Pulse Charging (HPPC) test is an important part of the battery performance test. HPPC test not only can evaluate the performance of a power battery but also can simulate the high current charge and discharge process of a power battery in actual application. Therefore, it is an important technology for testing the performance of power batteries.
The basic principle of the HPPC test is to charge the battery at a high current, discharge at a high current, and repeat the cycle. In order to ensure the accuracy of the test data, it is necessary to ensure the uniformity and stability of the test current. The test current can be selected according to the actual needs. Generally, the charge current is 1C~1.2C, and the discharge current is 1C~2C.
HPPC test has three main methods: constant current constant voltage (CCCV) method, constant power method, and continuous current constant time (CCCT) method.
1. Constant Current Constant Voltage (CCCV) Method
The CCCV method is to charge the battery at a certain current and stop charging when the voltage reaches a certain value. Generally, the charge voltage is determined according to the parameters of the battery. After the charge is completed, the battery is discharged at a certain current until the voltage reaches the cut-off voltage.
2. Constant Power Method
The constant power method is to charge the battery at a certain power until the voltage reaches a certain value, then discharge at a certain power until the voltage reaches the cut-off voltage. This method is suitable for testing batteries with different rated capacities.
3. Constant Current Constant Time (CCCT) Method
The Constant Current Constant Time (CCCT) method is to charge the battery at a certain current for a certain time, and then discharge at a certain current for a certain time. This method is suitable for testing the power performance of batteries with the same capacity.
In addition to the above three methods, there are also other methods such as the constant power constant time (CPCT) method and the constant voltage method. In the actual test, it is necessary to select the appropriate charging and discharging methods according to the specific requirements.
To sum up, the power battery HPPC test is an essential method for testing the performance of power batteries. It can simulate the high current charge and discharge process of a power battery in actual application and can evaluate the performance of the power battery. In the actual test, the appropriate charging and discharging methods should be selected according to the specific requirements.
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