An article that takes you through how batteries are made?

What is the meaning of the very popular saying now, say goodbye to the era of battery rolls and enter the era of TV stacks?We should know that lithium-ion batte...

Sep 14,2023 | Jane

What is the meaning of the very popular saying now, say goodbye to the era of battery rolls and enter the era of TV stacks?

We should know that lithium-ion batteries for electric vehicles are mainly categorized into soft pack, cylindrical and square box types. They all work on the same principle. The interior is composed of positive pole, negative pole, electrolyte, and diaphragm,best lithium ion battery machine company and the movement of lithium ions is utilized to produce electric manufacturing.

The foremost thing in such a battery is the production of positive and negative electrode plates, and the positive electrode is the active material, such as nickel, cobalt, manganese, and ternary material powder.equipment for lithium battery assembly Motor graphite powder mixed with binder, hiking on aluminum foil and then dried and pressed, while the negative electrode is graphite powder mixed with binder coated on copper foil and then dried and pressed.

Just produced positive and negative electrode sheet is such a large roll, continuous long strip made of polyethylene, polypropylene and other polymer materials, diaphragm is the same.

How are these raw materials going to be put into the battery?

Cylindrical batteries rely on coils that stack the raw materials together in the order of negative electrode, diaphragm, and positive electrode diaphragm. They are coiled directly into a cylindrical shape by the winding method and then placed into a metal casing.

Transpackaged batteries rely on disks, such as the Z-shaped stacking method, which means that the positive and negative raw materials are first cut into the same size of rectangular grade pieces, and then stacked onto the diaphragm separately, which is threaded in a Z-shaped pattern, separating the two poles. Finally wrapped with aluminum-plastic packaging, and for square-type batteries have always used the winding method. Until 2019, Hive Energy officially launched the world's first square-case battery produced with a high-speed stacking process.

So what are the benefits of a battery stacked this way?

First of all, due to the large size of the square battery, the winding method will inevitably form arcs at the corners, resulting in gaps in the plate grid, and the disc ruler can make full use of the space. As far as possible, the energy density is about 5% higher than the former.

Secondly, after working for a period of time, the electric particle battery, both positive and negative pole pieces will lead to the emergence of expansion with a certain degree of influence. The degree of expansion of the inner and outer layers as well as different, there will be wave-like deformation, making the internal control structure of the battery is unstable, and in serious cases, it may also be fractured to cause traffic accidents. The battery with disc valve only expands up and down every time. The internal organizational structure can still be maintained flat, compared to the more secure, in the vibration and extrusion into the water, pinprick safety analysis test, the hive energy battery are more than the requirements of the national standard.

In addition, the disk method, due to the isolation of each positive and negative pole pieces from each other, so each pole piece should be installed with a pole lugs, and then welded together separately to form the final positive and negative poles. However, the insulated winding method in order to reduce the process. Will be several layers apart before installing a pole ear, the total number is usually only half of the former, however, the second charge of the battery's wire disk method because there are more gil, its cross-section is also larger than the winding method, and follow the reduction. Then the battery also generates less heat as it works and is less likely to expand.

According to Hive Energy's tests, the stacking method, compared to the winding method will reduce the internal resistance by more than 10 percent. After cycling, the expansion force is expected to be more than 40 percent lower and the lifespan 10 percent higher.

Although the stacked sheet battery has significant advantages, in the growth process to collect multiple positive and negative levels of the old on the process requirements are higher, the production efficiency is usually only half of the winding method. So for a long time, the square shell battery has been in the roll era, stop.

However, with the modernization of production equipment, this situation has been reversed. Beehive Energy has taken the lead in completing the development of the industry's first 45-degree rotary high-speed laminating equipment and put it into use. Laminating efficiency has reached a single station, each piece only 0.6 seconds, more than 40% of the traditional laminating equipment.

In addition veteran battery manufacturers have also planned to introduce the lamination process after 2023. In this megatrend. Hive Energy and a number of equipment suppliers have successfully developed, further improving the efficiency to a single station 0.45 seconds per piece of laminated equipment.

From the hive energy applied for more than a dozen patents, we know. Their goal is to reach a layering efficiency of 0.25 seconds per kilometer, faster than winding, by 2023. Similar technological developments benefit other aspects of contemporary life. For example, this automated folding machine can fold a garment in less than six seconds, bringing the boring task of sorting clothes and batteries into the age of automated folding.

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