Lithium battery safety Test know how much?

The safety testing of lithium batteries is a key link to ensure their safe and reliable operation in various application scenarios. The following are the main items of lithium battery safety testing and their details:

1. Overcharge test: The purpose of testing overcharge is to evaluate the safety performance of the battery in the case of overcharging. The battery may have problems such as increased temperature, gas generation, and reduced capacity under overcharge conditions. For example, the UL2054 standard requires that the battery should not cause fire, explosion and other dangerous situations under overcharge conditions.

2. Over-discharge test: The over-discharge test is used to evaluate the safety performance of the battery in the case of excessive discharge. The battery may have problems such as voltage drop, temperature rise, and capacity loss under overdischarge conditions. For example, the IEC 62133 standard requires that the battery should not cause fire, explosion and other dangerous situations under over-discharge conditions.

3. Short circuit test: test short circuit analog battery accidental short circuit, evaluate the battery's ability to withstand the impact of short circuit current. The battery should not catch fire or explode during short circuit, and the open circuit voltage after short circuit should not be less than 90% of the nominal voltage.

4. High and low temperature test: high and low temperature test to evaluate the performance and safety of the battery under different temperature conditions. This includes the capacity, voltage and cycle life of the battery at both high and low temperatures. For example, the IEC 62133 standard requires that the battery should not have fire, explosion and other dangerous conditions at high and low temperatures.

5. Mechanical impact test: mechanical impact test simulates the safety of batteries when they are subjected to mechanical impact (such as falls, collisions, etc.). During the test, parameters such as the deformation degree and voltage change of the battery will be recorded, and whether there is a fire, explosion and other phenomena will be observed.

6. Heat abuse test: heat abuse test at high temperature (usually 130 ° C) conditions to investigate the safety of the battery, the battery can not break, fire, explosion and other risks.

7. Low pressure test: Low pressure test simulates the safety performance of batteries in low pressure environments such as high altitude.

8. Internal short circuit test: internal short circuit test to check whether the battery management system can effectively prevent internal short circuit, so as to ensure the safe use of the battery.

9. Heat spread test: The heat spread test assesses whether the thermal runaway of the battery system will spread to the entire battery system when the single cell is thermal runaway.

10. laser induced thermal runaway propagation test: laser induced thermal runaway propagation test simulates the safety performance of batteries at extreme high temperatures, requiring that adjacent cells cannot ignite.

11. Vibration test: simulate the vibration environment that the battery may encounter during transportation or use, and evaluate the performance and durability of the battery under these conditions.

12. puncture test: Puncture test by using a sharp object to puncture the battery, evaluate the puncture resistance of the battery diaphragm, this test is crucial to improve battery safety.

13. drop test: The drop test simulates the situation of the battery falling from a certain height to a hard surface to evaluate the structural integrity and safety of the battery. After the test, it is necessary to observe whether the battery has damage, leakage, or fire.

14. extrusion test: The extrusion test is used to evaluate the safety of the battery when it is subjected to mechanical extrusion, simulating the pressure that the battery may be subjected to during actual use. During the test, parameters such as the deformation degree and voltage change of the battery will be recorded, and whether there is a fire, explosion and other phenomena will be observed.