What is lithium ion battery cell grading?

Simply, li-ion battery grading is cell capacity grading or sorting, performance screening and grading. When the battery cell is being graded, the data of each detection point is obtained through computer management, so as to analyze the data such as the capacity and internal resistance of these batteries, and determine the quality grade of lithium battery. This process is called cell grading. After a batch of lithium batteries are made, although the size is the same, the capacity of the batteries will happen to be different. Therefore, each battery must be fully charged according to the specification, and then fully discharged according to the specified current. The capacity of the battery is the time taken to discharge the electricity multiplied by the discharge current. Only when the tested capacity meets or exceeds the designed capacity, the lithium battery is qualified, while the battery less than the designed capacity cannot be regarded as qualified.

What is the function of lithium battery capacity sorting?

The produced lithium batteries cannot be sold immediately. They should be stored for at least 15 days. The lithium batteries produced cannot be sold immediately. They should be stored in storage for at least 15 days. During this period, some internal disadvantages will appear, such as excessive self discharge, so as to eliminate those whose capacity can not reach the grade or quality problems.

The battery capacity grading machine has various channels like 256 channels, 512 channels, and each channel can start and stop individually with fast reatction speed. Each channel has independent constant current source and constant voltage source. The current and voltage are sampled in real time, and the constant flow and constant voltage can be switched continuously without disturbance. It can be used for cycle life test.

The classification and grouping of lithium batteries is to select the monomers with the same internal resistance and capacity for combination. When come into a pack, only those with very similar performance can form a lithium battery pack. For example, in order to meet the energy demand of electric vehicles, power battery packs often need to be composed of dozens to thousands of batteries. Affected by the complexity of the system, the behavior of battery packs has its uniqueness. It is not a simple addition and subtraction method of single batteries that can obtain the performance of lithium battery packs.

Requirement capacity accuracy of lithium battery

In order to improve the cycle life, stability, self discharge, safety and other electrochemical properties of lithium batteries, the consistency of lithium batteries must be strictly controlled or the battery grade must be accurately evaluated. Therefore, there are high requirements for the measurement accuracy of current and voltage of chemical forming and capacity grading equipment, which is limited to the acquisition accuracy of sensors. For chemical formation, the higher the control accuracy of current and voltage is, the better the quality of lithium battery products will be. The accuracy of current and voltage sensor above 1 / 10000 is an ideal choice.

Lithium battery is widely used in various fields such as electronic products because of its excellent performance such as high energy density, high voltage, high cycle, high safety and green environmental protection. Therefore, it is very important to ensure the consistency and reliability of lithium battery products.

ACEY NEW ENERGY TECHNOLOGY CO.,LTD supplys high precision battery capacity grading machine with different voltage and current requirements.