What are the functions of a comprehensive battery tester?

What are the functions of a comprehensive battery tester?

A comprehensive battery tester is a device used to test battery performance, which can comprehensively and accurately evaluate multiple performance indicators of the battery. The following is a detailed introduction to it:

Working principle:

Constant current discharge method: By setting a constant discharge current until the battery is discharged to a certain voltage value, the actual capacity of the battery can be measured. This method can accurately measure the capacity performance of the battery under specific discharge conditions, which is of great significance for evaluating the battery's endurance.

AC impedance method: By applying an AC voltage, the AC impedance of the battery is measured, and then the health status and internal resistance of the battery are estimated. The internal resistance of the battery is one of the important parameters reflecting its performance status. Batteries with smaller internal resistance have lower energy loss during the charging and discharging process and have relatively better performance.

Main functions:

Basic parameter measurement:

Voltage test: The open circuit voltage, charging voltage, and discharge voltage of the battery can be measured. The voltage parameter can intuitively reflect the current state of the battery. For example, the open circuit voltage of a normal lithium battery in a fully charged state is usually around 4.2V.

Internal resistance test: Internal resistance is one of the key indicators for measuring battery performance, which reflects the resistance inside the battery. The smaller the internal resistance, the lower the energy loss of the battery during the charging and discharging process, and the better the battery performance. The battery comprehensive tester can accurately measure the internal resistance of the battery to help users judge the health and service life of the battery.

Current test: The ability to measure the current size of the battery during the charging and discharging process is very important for evaluating the battery's charging and discharging capabilities and determining the appropriate charging and discharging parameters. For example, when testing the power battery of an electric vehicle, it is necessary to accurately measure its charging and discharging current to ensure the safety and performance of the battery.

Capacity test: By charging and discharging the battery, the charging capacity and discharge capacity of the battery under specific conditions are measured to evaluate the battery's energy storage capacity. This is one of the important indicators for judging the performance of the battery. Users can understand the battery's endurance based on the capacity test results.

Charge and discharge function test: Simulate the actual charging and discharging process of the battery to detect the battery's charging efficiency, discharge efficiency, and charge and discharge cycle performance. Charge and discharge cycle performance refers to the attenuation of the battery's performance after multiple charges and discharges. This performance is particularly important for batteries that require frequent charging and discharging, such as the power battery of an electric vehicle.

Safety performance testing: The battery is tested under extreme conditions such as overcharge, over discharge, and short circuit to ensure the safety of the battery in various usage environments. For example, during the battery production process, each batch of batteries must be tested for safety performance to prevent batteries with safety hazards from entering the market.