Take a 3C lithium battery as an example:
1. Continuous charging: a fully charged cell 20 plus or minus 5C. According to the manufacturer's regulations, it will not catch fire, explode or leak when charged for 28 consecutive days.
2. Standard vibration test: fully charged battery cell 20 plus or minus 5C, amplitude 0.8MM, 1Hz/min, between 10-55Hz, three mutually perpendicular directions, each axis tested for 90 minutes. No fire, no explosion, no leak.
3. Temperature cycle: Fully charged cells are placed in a battery test box and the cells are subjected to the following cycle tests. A.) 75+2C4 hours B.) 20+5C2 hours C. )-202C2 hours D) 205C2 hours E. ) Repeat A to D 4 times. F) After 5 cycles, store for 7 days before testing.
4. External short circuit: if the fully charged battery core is 20+5C and 55+2C, short circuit with a resistor with a total resistance of less than 100 milliohms, it will not catch fire and explode. .
5. Free fall: fully charged battery core 20+5C, fall from a height of 1 meter onto the cement floor in any direction to achieve impact, 3 times in a row, without fire or explosion.
6. Mechanical vibration: fully charged battery cell 20+5C, maximum acceleration 125-175gn, 3 vibrations of the same intensity in 3 mutually perpendicular directions. No fire, no explosion, no leak.
7. High temperature: A fully charged battery core will not catch fire or explode if placed in an environment of 130 + 2 C for 10 minutes!
8. Battery core pressure: 20+5C, Use a force of about 13Kn in two planes to compress the fully charged battery core so that the longitudinal axis of the battery core is pagoes along with the plan. Once maximum pressure is reached, release it immediately. No fire, no explosion.
9. Low voltage: Fully charged battery cell maintains 20+5C, 11.6Kpa for 6 hours, no fire, no explosion, no leakage. 10. Overload: 20+5C, discharged battery cell is equal to 10V in heavy rain, charging current is equal to lrec, time is 2.13CZ/rec, rec is equal to current constant recommended by the manufacturer for charging. The unit is the Ampere. No fire, no explosion!
11. Forced discharge: 20+5C, the discharged battery core is discharged with a constant current of 1ItA for 90 minutes. No fire, no explosion!
The above standards are common for 3C lithium batteries in different testing environments. Stable current transmission is required during testing, and high-current shrapnel microneedle modules are used pto maintain current conduction and signal. Transmission, playing a stable connection role.
What is the lifespan of lithium battery cells stipulated in the national standard?
IEC 62620 is a standard published by the International Electrotechnical Commission (IEC) to evaluate and test the performance and safety of lithium-ion battery charging equipment. Completeness. This standard applies to different types of lithium-ion batteries, including ternary lithium batteries and lithium iron phosphate batteries.
This standard includes several test items and evaluation standards, the main ones include: charger electrical characteristics test, charger mechanical characteristics test, safety test, EMC test (compatibility electromagnetic) and environmental tests.
The following are specific test and evaluation items that may be includeds in the IEC 62620 standard:
Testing the electrical characteristics of the charger
Including output voltage, output current, output test power, waveform of exit, etc. to ensure that the electrical parameters of the charger meet standard requirements.
Testing the mechanical properties of the charger
Including testing on appearance, size, insertion and extraction force, etc. to ensure that the mechanical properties of the charger meet standard requirements.
Safety tests
Including tests for overheating protection, short circuit protection, overcurrent protection, etc. to ensure that the charger will not harm personal safety under normal conditions. to use.
EMC tests
Including electromagnetic radiation and anti-electromagnetic interference tests to ensure that the charger will not cause interference withsurrounding electronic equipment.
Environmental testing
Including temperature, humidity, vibration, impact testing, etc. to simulate the working conditions of the charger in different environments and ensure that the charger can work in various environments. The performance and safety in the conditions meet the standard requirements.
In short, IEC 62620 is a very detailed and strict standard designed to ensure that the performance and safety of lithium-ion battery charging equipment meets international standards. Ternary lithium batteries and lithium iron phosphate batteries can pass the testing and evaluation of this standard.
The battery specification GB/T182872000 mentions that the life of lithium battery cells is 300 cycles and the capacity is less than 80% of the original capacity; the lifespan is For thosewhich have more than 300 cycles, for example, lithium batteries produced by domestic relatively powerful lithium battery manufacturers Grepu Battery, BYD, Gaoneng, Lishen and other manufacturers have shown that they can reach 500 cycles under conditions normal use.