Why Should The Capacity Of Lithium Batteries Be Divided?

With the rapid development of social economy, secondary batteries are highly efficient, clean and pollution-free. Lithium-ion batteries have obvious advantages in cycle life, energy density, power density and environmentally friendly performance. Therefore, lithium-ion batteries are the ideal power source for electric vehicles and hybrid batteries in the future. In the manufacturing process of lithium batteries, the cells need to be formed and divided to ensure the quality and quality of the final power supply product.

What is the capacity of lithium battery

The first explanation: simple understanding is capacity sorting and performance screening. When the lithium battery is divided, the data of each detection point is obtained through computer management, so as to analyze the size and internal resistance of these battery capacity, and determine the quality level of the lithium battery. This process is divided. After the lithium battery is divided for the first time, it needs to stand for a period of time, usually no less than 15 days. During this period, some inherent quality problems will manifest.

The second explanation: After a batch of lithium batteries are completed, although the size is the same, the battery capacity will be different. Therefore, the equipment must be fully charged according to the specifications, and then discharged (discharged) according to the specified current. The time it takes to discharge the electricity multiplied by the discharge current is the capacity of the battery. Only the tested capacity meets or exceeds the designed capacity, the lithium battery is qualified, and the battery with less than the designed capacity cannot be regarded as a qualified battery. The process of screening out qualified batteries through capacity testing is called sub-capacity.

The role of lithium battery capacity

Partitioning is not only conducive to the stability of SEI membranes, but also shortens the time spent in the subparting process, reduces energy consumption and increases productivity.

Another purpose of volume division is to classify and group batteries, that is, to screen out monomers with the same internal resistance and capacity as the combination. When combining, only the performance is very close to form a battery pack.

For example, in order to meet the energy requirements of electric vehicles, power battery packs often require dozens to thousands of batteries. Due to the complexity of the system, the behavior of the battery pack has its own unique characteristics, not a simple battery. The addition and subtraction method can get the performance of the battery pack.

Lithium battery precautions

The lithium battery just produced cannot be sold immediately, and should be stored in the warehouse for at least 15 days. During this period, some inherent deficiencies have manifested, such as excessive self-discharge, etc. core.

After getting the order, take it out again to test again and divide again, that is to say, charge and discharge again, eliminate the capacity that does not reach the grade, or eliminate the quality problem, and then give the sales department with about 50% of the electricity, and finally Mobile phone battery block assembly plant in the hands.

With the rapid development of smart wireless devices and electric bicycles and cars, the market demand for lithium batteries is becoming wider and wider, and the manufacturing efficiency is becoming higher and higher. Due to the need for energy saving and emission reduction, lithium battery formation is also using energy feedback Form to achieve energy saving and environmental protection.

Therefore, performing several shallow discharge and shallow charge cycles before the full discharge of the volume dividing process not only benefits the stability of the SEI film, but also shortens the time consumed by the volume dividing process, reduces energy consumption and increases productivity.