IEC 62620 is a standard published by the International Electrotechnical Commission (IEC) for the evaluation and testing of the performance and safety of lithium-ion battery charging equipment. 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 included in IEC 62620:
Testing the electrical characteristics of the charger
Including output voltage, output current, output test power, output waveform, etc. for guaranteedr 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 with surrounding electronic equipment.
Environmental testing
Including temperature, humidity, vibration, impact testing, etc. to simulate the working conditions of the loader in difdifferent environments and ensure that the charger can work in various environments. Performance and safety in the conditions meet 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.
Question 1: What is the meaning of lithium battery capacity classification? After a batch of lithium batteries is manufactured, although the size is the same, the capacity of the battery will be different. Therefore, the device must be fully charged according to specifications and then discharged (fully discharged) according to the specified current. The time required to discharge the battery multiplied by the discharge current corresponds to the capacity of the battery. Only when the tested capacity meets or exceeds the designed capacity is the battery qualified. Batteries below the designed capacity cannot be considered qualified. This process of selecting qualified batteries through capacity testing is called capacity classification. I don't know if I can help you.
Question 2: Why do lithium battery cells need to be tested in a chemical composition and capacity cabinet (on the cabinet? There are many vertical cabinets like this in battery cells). factories, arranged in rows. Each cabinet can contain hundreds of cells, or hundreds of test points. In fact, these cabinets are like chargers, except that they can charge a large number of batteries at the same time, and each detection point is obtained thanks toIT management. Data. Lithium battery cells are formed here to get the capacity, and knowing the size of the capacity is called capacity division. By dividing the capacity, the quality of the battery core is determined (of course, determining the quality also depends on indicators such as internal resistance.) From this point we can see that lithium batteries are “electric” after their production, which is not what some people think. It is in an "exhausted state" and needs to be "activated" before use
The produced lithium battery cells cannot be sold immediately and must be stored in the warehouse for. at least 15 days. During this period, some inherent disadvantages appear, such as excessive self-discharge, etc. After receiving the order, cells that have reached the shelf life in the warehouse are removed and testeded again and the capacity is divided again, that is, they are loaded and unloaded again, and the capacity does not reach the level, or those with quality problems are eliminated, and then handed over to the sales department with approximately 50% of the value. power, and finally transmitted to the mobile phone battery pack assembly factory. Battery assembly plants usually have lithium battery forming machines, but the scale is not as large as that of battery cell manufacturers. After receiving the batteries from the battery factory, Panda, China. In order to avoid being deceived by the battery factory and to be responsible to consumers, we have re-divided the batteries that will be used for battery assembly into mechanical components. Through this process, you can still select some batteries that do not meet the requirements. returned to battery factorys. After passing the mechanical test of the lithium battery, it can be seen that the batteries have been charged and discharged, so they have two electric cells.
Question 3: One month after the 18650 lithium battery was separated and stored in the warehouse, why is it necessary to redistribute it for fear of abnormal attenuation of battery capacity
Question 4: What do “formation” and “capacity division” mean in lithium battery performance testing? Training: Generally refers to the implementation of a series of process measures on the initially charged battery to stabilize its performance, including low current. charging and discharging, standing position, constant temperature below 60°C, etc., there are also charging and discharging procedures that specifically refer to the first charge to complete the activation of the battery electrodes
Capacity Sorting: A simple understanding is capacity sorting. , Performance Screening and Ranking
Question 5: What is the specific process or steps of lithium battery formation and capacity division? low current charging to activate material activity and arcing. The process is the key process, and every manufacturer is different, so there is no way to tell you the training process
In terms of capacity, it needs it. to sort because the consistency of domestic manufacturers' batteries is poor
If you talk about the specific operation of the operator, it is actually to install the battery on the chemical composition cabinet
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Question 6: During battery production, the capacity of lithium batteries is divided. What does the number of steps in the How to Get It process mean? The number of steps in the process for classifyinglithium batteries in 5 points refers to the number of steps in the process? number of steps in the battery grading process.
For example:
1.0.2c constant voltage charging at 4.2v
2 . Leave it aside for 10 minutes
3.0.2c Discharge at 2.75 V
4 Leave it aside for 10 minutes
5. Charge at 3.9V with constant current and voltage
6. End
Different manufacturers have different capacity classification methods, but they are basically the same. Adjust them according to your own and the customer's needs.
Question 7: Lithium Batteries When dividing capacity, how is capacity calculated? First, charge the battery to 4.2V. Then discharge the lithium battery with some current, put it at 3.0V and take a sample every second or 1 millisecond. Capacitance is the accumulation of voltage * current * temps discharge
< p> Question 8: Lithium What is the difference between using large current and small current to classify battery capacity? I know that for battery capacity classification, the difference between using large current and small current is as follows
1. Large current capacity classification, the capacity division time is short, and the small current capacity division time is long. Now many manufacturers use 0.5-1c for capacity division.
Theoretically, 0.2c capacity division takes 5 hours. and 1c only takes 1 hour, the time is inversely proportional to the current size
2. Generally speaking, the capacity divided by a small current is greater than the capacity divided by 1c, but the difference should be around 0.5-2%
If there is a big difference, it means that there are some problems with thequality of the battery itself.
Question 9: Why do lithium batteries need to be broken down into components and then left aside for a while before shipping? Check for leaks
Question 10: What is the meaning of lithium battery Capacity Division? After a batch of lithium batteries is manufactured, even if the size is the same, the capacity of the battery will be different. Therefore, the device must be fully charged according to specifications and then discharged (fully discharged) according to the specified current. The time required to discharge the battery multiplied by the discharge current corresponds to the capacity of the battery. Only when the tested capacity meets or exceeds the designed capacity is the battery qualified. Batteries below the designed capacity cannot be considered qualified. This qualified battery selection processed through capacity testing is called capacity classification. I don't know if I can help you.