New production of lifepo4 battery​, what tests need to be carried out

Newly produced lithium batteries need to undergo a series of rigorous tests to ensure their performance, safety and reliability. The following is a detailed summary of these tests: Physical characteristics test Size and weight test: Measure the size and weight of the battery to ensure that they meet the design requirements. Appearance check: Check the shell, pole, and label of the battery for defects or damage. Housing strength test: Test the strength and durability of the battery housing by applying pressure or extrusion pressure.

Second, electrical performance test capacity test: through the specific charging and discharging equipment, according to the set current and time for charging and discharging operation, measuring whether the battery released electricity reaches the nominal capacity. Internal resistance test: Use a professional internal resistance tester to measure the internal resistance value of the battery in different states (such as charging, discharging, standing). The internal resistance reflects the resistance inside the battery and has an important impact on the power output, charging efficiency and self-discharge performance of the battery. Voltage test: includes the measurement of open circuit voltage and operating voltage. The open circuit voltage refers to the terminal voltage of the battery when the load is not connected, and the working voltage is the actual output voltage of the battery under load. Testing voltage changes under different conditions can assess the performance stability of the lifepo4 battery and the degree of match with the device.

Rate performance test: test the performance of the battery under different charge and discharge rates, the higher the rate, the greater the charge and discharge current. For example, test the capacity, internal resistance, and voltage of the battery at different rates such as 0.5C, 1C, and 2C to understand the performance change of the battery during rapid charging and discharging, and whether it can meet the requirements of high-power application scenarios. Self-discharge test: Measures the rate of natural discharge of the battery in the static state. The lower the self-discharge rate, the better the storage performance of the lifepo4 battery. Discharge characteristic test: including battery discharge curve, discharge efficiency, etc.

Safety testing (need to be carried out in special testing institutions, these institutions usually have professional testing equipment and technical personnel, can ensure the accuracy and reliability of the test, and provide detailed test reports and certifications) overcharge testing: Simulate the performance of the battery in the case of overcharge, check whether the battery has a safety protection mechanism, such as whether it will trigger the overcharge protection circuit, whether the battery will heat, expand or even fire and explosion. Overdischarge test: To check the safety of the battery under excessive discharge. Excessive discharge may cause irreversible damage to the battery and reduce battery life. Short circuit test: artificially create a short circuit between the positive and negative electrodes of the battery to observe whether the short circuit protection function of the battery is effective, as well as the temperature change of the battery during short circuit, whether it will smoke and fire. Needle test: Pierce the battery with a sharp object (such as a steel needle) to simulate the situation of the battery when it is punctured by a sharp object, and check whether the battery will have a violent chemical reaction, fire or even explosion.

Squeeze test: The battery is placed in the extrusion device and a certain pressure is applied to test the safety and stability of the battery when it is squeezed by external forces. Heavy impact test: Apply instantaneous impact force to the battery to test the safety and stability of the battery when it is impacted by external forces. Thermal stability test: Put the lifepo4 battery in different temperature environments (such as high temperature and low temperature) to observe the performance changes of the battery and whether there will be problems such as thermal runaway. Temperature cycle test: the battery is cycled several times in different temperature ranges, such as from low temperature to high temperature and back to low temperature, to detect the performance stability and reliability of the battery in the process of temperature changes. Humidity testing: For lithium batteries that may be used in humid environments, such as batteries for outdoor equipment, humidity testing is required to assess their performance and reliability in high humidity environments.

Vibration test: Simulate the vibration that the battery may be subjected to during transportation and use, and test the structural strength and connection reliability of the battery. Low pressure test: Simulate the use of the battery at high altitude or low pressure environment to check whether the battery leaks or bursts. Electromagnetic compatibility (EMC) test: evaluate the battery's interference and anti-interference ability in an electromagnetic environment. Environmental performance test: Detect the heavy metal content and harmful substance content in the battery to ensure that it meets environmental requirements. Cycle life test: Through multiple charge and discharge cycles of the battery, observe the capacity attenuation of the battery to evaluate the service life of the battery.