Lithium iron phosphate battery is widely used in various fields due to their advantages of wide raw material sources, good rate performance, and excellent safety performance. Their friendly electrical performance comes from strict monitoring of various parameters. The performance testing projects of lithium iron phosphate batteries are extensive, mainly including the following categories:
1、 Performance testing project
1. Capacity testing:
The energy storage capacity of a battery is tested using constant current discharge, constant power discharge, or constant resistance discharge methods, usually in ampere hours (Ah).
The specific steps of operation: After fully charging the battery, connect it to the discharge device, set a constant discharge current or power, and record the discharge time and voltage until the battery voltage drops to the cut-off voltage. Calculate the battery capacity based on the discharge time and current.
2. Cycle Life Test:
Test the performance degradation of the battery after multiple charging and discharging cycles, including capacity retention rate and increased internal resistance.
The specific steps of the operation: perform multiple charging and discharging cycles on the battery, record the discharge capacity and number of cycles for each cycle, and analyze the degradation of battery performance.
3. Charging and discharging performance testing:
Including tests on charging efficiency, charging time, discharge efficiency, discharge time, discharge power, and other aspects.
Specific steps of operation: Conduct charging and discharging experiments under standard conditions, record parameters such as charging current, charging time, discharging current, and discharging time, and calculate performance indicators such as charging efficiency and discharging efficiency.
4. Temperature performance test:
The performance and lifespan of batteries are also affected by environmental temperature.
Specific steps of operation: Expose the battery to different temperatures and conduct charge discharge tests. This can help determine the performance and reliability of the battery under different temperature conditions.
5. Internal resistance test:
Measure the internal resistance of the battery to evaluate its performance and output power.
Specific steps of operation: Use an AC or DC internal resistance testing device for internal resistance testing, and record the test results.
6. Multiplication test:
Measure the performance of batteries at different discharge rates to evaluate their performance under high rate discharge.
Specific steps of operation: Conduct discharge experiments at different discharge rates, record discharge time, voltage and other parameters, and evaluate the performance of the battery.

2、 Security performance testing project

1. Short circuit test:
Short circuit the positive and negative terminals of the battery and observe whether there is a short circuit, explosion, fire, or other phenomenon in the battery.
Specific steps of operation: Use a wire with a resistance not exceeding 50m Ω to short circuit the positive and negative terminals of the battery, observe and record the temperature changes and surface phenomena of the battery.
2. Overcharge test:
Overcharge the battery and observe if there is any thermal runaway, fire, explosion, or other phenomena caused by overcharging.
Specific steps of operation: Use an overcharging device to conduct overcharging experiments on the battery, observe and record changes in parameters such as temperature and voltage of the battery.
2. Over discharge test:
Overdischarge the battery and observe for any damage or safety issues caused by over discharge.
Specific steps of operation: Use an over discharge device to conduct over discharge experiments on the battery, observe and record changes in parameters such as temperature and voltage of the battery.
3. Squeeze test, needle puncture test, impact test, drop test, etc.:
Test the battery through physical means such as compression, puncture, impact, and drop to observe if there is any damage or safety issues.
Specific steps of operation: Use specialized testing equipment to conduct experiments such as squeezing, needling, impact, and dropping on the battery, observe and record the performance and parameter changes of the battery.
The specific operation steps of the above testing items may vary depending on different testing equipment and requirements. In actual testing, it is necessary to operate according to specific testing standards and requirements, and record detailed test data and results in order to evaluate and analyze the performance of the battery.