Harm of water to power lithium battery and vacuum drying method
As for water, it has three forms. At the same time, water is also very naughty, very capable, and likes to make trouble. Let's take a look at how it tosses in the battery. First, it will vaporize, expand, electrolyze, react with the electrolyte, and then form crystals with materials and so on. Then it is a big problem in terms of safety, and it will explode, smoke, and burn. Wu Hewei said that for power lithium batteries, this safety issue is even more demanding. Why? Because a battery board is composed of many single batteries. The performance of the entire battery panel is actually determined by a single individual. More precisely, it is determined by the worst one among the individual individuals. Why? When charging in the battery board, the worst battery is the most likely to be overcharged. Then in the process of discharging, the worst battery is easy to over-discharge, so it is most likely to have a violent reaction, which will trigger the reaction of the entire battery board, which will cause many problems.
Wu Hewei said that power lithium batteries must be vacuum-dried, which is a self-evident consensus among battery companies, but the current traditional vacuum drying method for power lithium batteries is very low in automation, and its shortcomings are quite obvious, such as low efficiency and high energy consumption. Consistency is very poor. The low degree of automation has greatly hindered the outbreak of the output of the entire automated production line. In the face of the huge market for power lithium batteries that are in short supply, sometimes we can only sigh.Also read:https://www.aimeno.com/lithium-battery/215.html
How to dry the power lithium battery? Wu Hewei said that moisture can be controlled in the links of materials, pole piece coils, pole pieces and batteries, and vacuum drying can be done. Taking activated carbon as the negative electrode material as an example, it can be seen that the activated carbon monomer is covered with many capillary pores, and its surface area is very large. It is possible that the surface area of 2 grams of activated carbon can fill the entire tank of Times High-Tech. The surface of these pores absorbs a large amount of water and impurities, which is what Times High-Tech wants to dry.
After determining the water control point, you can start drying. For traditional drying, take battery drying as an example. First, build a drying room, manually load and unload materials, and the single bellows must independently complete multiple functions such as preheating, vacuuming, and pressure maintaining. , one person has to complete many functions. In this process, the efficiency is low, the energy consumption is high, the products produced by different single bellows are poor, and there are many contacts in the manual handling process, resulting in bad results.
According to Wu Hewei, this is a schematic diagram of Times Hi-Tech tunnel vacuum drying system. You can see that there are two shelf trucks on the far right. After passing through the preheating section, the vacuum drying section, the cooling section, and finally the exit from the tunnel. In fact, this export directly enters the next process. After coming out, the material has been dried. After unloading, the empty material truck passes through the transfer of Times Hi-Tech, and then returns to the front end to complete the next cycle. In this process, it can be seen that no drying room is required, no manual operation is required, and the working environment in the tunnel is always constant 24 hours a day, thereby achieving automation, consistency and low power consumption.Also read:https://www.aminobattery.com/lithium-battery/205.html
This is the schematic diagram of Times High-Tech tunnel vacuum drying system. In fact, if the actual schematic diagram needs to be refined, it has many, many processes. It can roughly be divided into three sections, which are the theory of Times High-Tech, and the technology of Times High-Tech, which divides the original single bellows and several functions that it needs to complete into independent sections. These sections professionally complete each A function of its own, and then continuously connect between segments.