The Process Of Positive And Negative Electrode Batching

Lithium batteries' performance and other battery chemistry depend on their manufacturing process. This is why some batteries are stronger than others.

There is a need to understand how the batteries are created if you want to get the most from them. Different batteries are designed differently, offering a wide range of use.

This guide will present two of the most important processes involved in batching batteries. As you may already know, batteries are defined by their negative and positive electrodes, which allow the movement of ions through the electrolyte. Today, we look at the coating and winding processes.

Keep reading to discover the cover.

In The Coating Process

The battery chemistry can be quite complex for beginners. So many things are involved in the process that can make everything seem a little strange for the first time. But once you understand the basic chemistry and operation, you will have no problem finding the right battery and user conditions.

The coating process is one of the main processes involved in making batteries. It is all about the preparation of the negative and positive materials for the most efficient performance.

Understanding the raw materials will help you understand this process much better. Generally, the electrode comes with active and inactive materials, binders, and solvents. These materials are prepared into slurry based on the viscosity and solid content requirements. Each material is selected in a certain proportion to ensure proper mixing.

Note also that the positive and negative electrodes must be prepared separately. Mixing them in this initial step will not provide the most desired results, making it hard for the battery to perform efficiently, if it works at all.

Once the raw materials are prepared, the next step of coating can follow. This is one of the most important steps, as it sets the perfect environment for putting the negative and positive electrodes in place.

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The coating process is the first process during the preparation of the negative and positive pole pieces. It takes place in a coating machine, where all the technical requirements are set effectively according to the technical requirements.

The slurry mentioned in the first stage above is evenly coated on the conductive metal foil's front and rear sides. This process seeks to ensure the positive electrode slurry is coated on the aluminum foil, as the negative electrode slurry is coated on the copper foil.

Just like the raw materials were prepared separately, there is a need for both electrodes separately. Doing so ensures the safety of the material while creating the safest working environment too. It all comes down to the perfection of this process.

The coating process is extremely important and delicate. It might seem easy, but there is a lot more that goes in than meets the eye. And this is why it requires a professional with the right skills to understand proper preparation and setting on these materials.

When Winding

There are many other steps involved in manufacturing batteries. Batching is just one of these steps involving coating and winding.

Winding and stacking is a process that must also be considered with dire keenness. Any wrong move and everything that happened in the coating process goes to waste. Thus, you must be extremely careful and get everything in its rightful position.

The winding and stacking process begins after the diaphragm is made into a core. This is the initial step of the winding process, which leads to a large curvature of electrodes on the edges, allowing for easy charge and discharge. In other words, the winding process ensures your battery will take in energy efficiently and release it as expected when the right time comes.  

Extreme care must be taken to protect the weaved layers from deformation and distortion. If this happens, the battery’s performance will degrade and even lead to safety hazards. Aside from that, the current distribution on either side must be even during cell discharge. Any deformation will cause unevenness, increase the voltage polarization and affect the stability of the discharge voltage.

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Unlike the winding process, the stacking process involves a lot more work. This is because it involves cutting off the electrode sheets and diaphragm to make pieces. The positive and negative electrodes are cut, heat lamination is done, and then finishing up with stacking, hot pressing, and glue wrapping. When the qualified rate of electrode slitting is low, maintaining a high level of consistency and alignment accuracy is quite difficult.

Generally, the winding is more efficient and simpler. However, it does not produce as much quality as stacked sheets.

Winding occurs in special equipment where the positive and negative electrode sheet and the diaphragm are automatically unwinding. There is also automatic removal of dust, automatic winding of the electrode sheets, taping of the termination tape, and creation of other final productions. This is also where modules like automatic uploading, pressure weighing, and QR code labeling is done.

Winding speed is among the most important performance indexes in most battery factories. Therefore, there is a need to use the highest quality machines, focusing on efficiency and performance.  

The Impact Of Aging And Decline Of Battery Materials

All batteries deteriorate in their performance gradually throughout their lifetime. No matter how good a battery may seem to be, and no matter how strong it is in terms of capacity, it will come a time when the battery can no longer do anything. This is an irreversible process called aging, caused by physical and chemical changes inside the batter over the years of its performance.

Aging affects the battery negatively, and you can do nothing about it. The battery losses its capacity to hold charge and efficiency. A battery that could perform for a whole day reduces and only performs for a few hours per day.

Even though aging is a natural process, there are certain conditions that can fasten it. For instance, high charge currents, battery charging for too long even after a full charge, low-temperature charging, poor storage, and over-cycling of the cells.

You can make your battery last longer by using it in the best conditions. Put your device in the right temperature, charge properly, and use it in the right matter, and your battery will go a long way.