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Charging and discharging efficiency test of single battery
The charging and discharging efficiency of a single battery is an important index to measure its energy conversion and service efficiency. The charging and discharging efficiency not only affects the performance and application fields of the battery, but also has a profound impact on the economy and environment of the battery. This article will introduce the single battery charge and discharge efficiency test operation process and the required equipment.
what is charging and discharging efficiency
Charge and discharge efficiency refers to the ratio of energy that can be recovered from the battery during charging and discharging to the input energy, which is usually expressed as a percentage. High charging and discharging efficiency means that the battery can effectively complete the energy conversion process and reduce energy loss.
The charging and discharging efficiency can be calculated as follows.
[\ text {} to charge and discharge efficiency (%) = \ left (\ frac {\ text {discharge energy}} {\ text {filling the energy}} \ right) \] 100 times
Operation process of charging and discharging efficiency test
Preparation
Select test battery: Select the single cell to be tested and confirm the basic state of the battery (such as voltage and capacity).
Environmental conditions: Ensure that the test ambient temperature is 25°C and meets the working requirements of the battery. Changes in temperature may affect the test results.
Configuration of test instruments
Use a battery tester or electrochemical workstation to ensure accurate charging and discharging tests. The corresponding charging and discharging parameters are set according to the battery type.
Process of charging
Charge according to the charging standard of the battery. Constant current and constant voltage charging (CC-CV) mode is usually used, where the battery is charged to its rated voltage and held for a period of time (such as 1 hour) to ensure that the battery is fully charged.
During charging, the total energy charged to the battery, usually in Wh, is recorded.
Process of discharge
Set the discharge current parameter and start the discharge. The discharge current can be set according to the rated capacity of the battery, and common discharge multiplications include C/5, C/3, and 1C.
The voltage and current changes of the discharge were monitored, and the output energy of the battery during the discharge was recorded until the set cut-off voltage was reached.
Data logging
During charging and discharging, accurately record the following data:
Total energy charged to the battery (Wh)
Total energy released during discharge (Wh)
The charging and discharging efficiency is calculated and compared with the specification of the battery to evaluate the battery performance.
Multiple tests (optional)
To ensure the reliability of the results, the same battery can be tested for multiple charge and discharge cycles to see how the efficiency changes with the number of cycles.
Required instruments
When testing the charging and discharging efficiency of single battery, the following instruments and equipment are required:
Battery tester
A device specially designed for battery charging and discharging test, which can provide accurate stable charging and discharging control, and record battery voltage, current and energy information.
Electrochemical station
Provide a variety of battery test functions, including charge and discharge, cycle test, etc., suitable for research and development of battery performance in-depth analysis.
Energy meter
It is used to accurately measure the energy inflow and outflow during charging and discharging, ensuring high accuracy of energy data.
Data acquisition system
The parameters in the charging and discharging process were recorded in real time, which was convenient for subsequent data analysis and review.
Temperature monitoring equipment
The temperature change of the battery is monitored during charging and discharging to ensure that it operates within a safe range and prevent overheating and safety risks.
Precautions
Safety: Safety operation procedures must be followed to ensure a good test environment and prevent safety risks such as fire or explosion that may be caused by batteries.
Standardized test: Charge and discharge efficiency test is carried out in accordance with relevant international standards (such as IEC 62133, UL 2054, etc.) to ensure the reliability and consistency of the results.
Battery state check: Make sure there is no obvious damage to the battery before testing to ensure that the test results are accurate and reliable.
Conclusion
Safety: Safety operation procedures must be followed to ensure a good test environment and prevent safety risks such as fire or explosion that may be caused by batteries. Standardized test: Charge and discharge efficiency test is carried out in accordance with relevant international standards (such as IEC 62133, UL 2054, etc.) to ensure the reliability and consistency of the results. Battery state check: Make sure there is no obvious damage to the battery before testing to ensure that the test results are accurate and reliable.
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