Introduction of Pre-PACK Detection Procedure for Cylindrical Lithium Ion Power Batteries

The 18650 lithium-ion power battery has unique advantages in modularization and standardization of system development because of its high automation, good stability and high replace ability. It can effectively reduce production costs and save labor. Apart from the old Tesla, Porsche, Jianghuai, Zhongtai, Chang'an and Guangzhou Automobile have joined the R&D team of 18650 battery models. Industry insiders say that there will be more models in the future "falling in love" with 18650 batteries, which will drive a subversive change in the use of 18650 batteries.

However, everything has its duality, advantages and disadvantages coexist is normal things.18650 battery besides has the advantages, its disadvantages also cannot be ignored.18650 battery current biggest flaw is its single battery capacity is low, generally at about 2 ~ 4 ah, so the number of battery electric vehicle very much, such as Tesla motors requires 7000-8000 only 18650 battery connected Cheng Mo group in a reliable way. So much the number of batteries, the battery management more complex and demanding higher consistency.

In series and more fields such as electric vehicles, battery inconsistent affect the performance of the battery, and even brought some safe hidden trouble.

Lithium ion batteries Alone or small series-parallel when used, its security problem basically controlled, but when lithium ion battery mass with groups, especially for electric cars Power battery When used, its security problem is more prominent, lithium ion batteries with groups, because the quantity of monomer, complicated structure, the consistency of monomer filter matching and consistency management problem is more difficult, this makes the battery pack "short board" battery easily excessive aging, thereby safety accidents occurred more often in the process of use.

therefore, to solve the problem of the safety of the lithium ion battery pack, while increasing the safety of the battery monomer, from the Angle of the battery pack system, strengthen the lithium ion battery group security technology is very necessary and urgent.

There are many sources of inconsistency of battery material itself is not completely consistent, and the process of manufacturing cell can't control to each cell in any detail. This will lead to inconsistent capacity, inconsistent terminal voltage, internal resistance is not consistent, inconsistent life, etc. It is difficult to fundamentally solved. Group of batteries before detection filter is very necessary.

In addition to performance should be screened, the appearance of 18650 battery also need to test. Such as scratches, broken and stain on the surface of the test battery, pits and bumps defects, will affect the battery module assembly and the security features of group after.

The breakage of the plastic coated on the surface of the battery, for example, the safe hidden trouble that there will be a short circuit;

Surface stains, pit/convex point, etc., can also affect the circuit welding stability;

Plastic coated smoothness will also affect module assembly efficiency.

The length of the batteries and end face diameter uniformity also affects the production efficiency of module assembly.

So the appearance test is necessary before PACK process cannot ignore a link.

Have learned from Zhejiang mike automation engineering co., LTD. 18650 power lithium ion battery for electrical automation testing lines and lines of visual appearance, equipment function process as shown in the figure below:

This device can be used in the automatic detection of cell voltage, resistance and sorting. Specific functions as follows:

1. The consistency tests for all incoming batteries, use technical means to ensure that all batteries consistency and quality;

2. All the battery testing information in the cloud matching to each battery bar code, each battery detection information dating back; Check out to step of battery, and to eliminate defective batteries.

This device can simultaneously detect 30 batteries voltage, internal resistance, equipment sorting efficiency can reach 240 PPM (14400 m/h), the speed is the first domestic can do.

Mike's cylindrical batteries appearance test machine for the first time industrial vision technology into the batteries appearance test, solve the artificial detection speed, poor stability of the industry problems, test content including:

Cylindrical batteries appearance test and package (bag);

Cylindrical batteries length detection;

Cylindrical batteries end face diameter detection.

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