Air Shower Room for Application in Lithium-ion Battery Plant

The cost ratio of the air shower room in the lithium-ion battery drying room is very small, only a small part of it, but it is also a necessary equipment.

The air shower room is due to the rapid development of the electric vehicle industry in China, which has formed a huge market demand for lithium-ion batteries. Many battery manufacturers have also expanded their production capacity. Some companies have also used this shareholder's wind to enter the lithium-ion battery industry as an industry. People, the ion battery industry is not so beautiful, especially the lithium-ion battery factory is also a big expense. Today, I mainly introduce the application of the air shower in the drying room of the lithium-ion battery factory.

Regarding the air shower room, we also introduced in the front: the application of the air shower room in the lithium-ion battery production workshop, you can also refer to it when you have time.

The lithium-ion battery industry not only has a huge initial construction investment, but also requires a huge amount of capital for later operations. An important part of the lithium-ion pool production line-the investment and operating costs of the drying room are very huge.

The operating voltage of lithium-ion batteries can be as high as 4.2V, so the electrolyte can only use organic systems. The lithium salt usually used is generally lithium hexafluorophosphate, which makes the entire lithium-ion battery production process very sensitive to moisture. Therefore, the drying room is a lithium-ion battery , Especially necessary for large-scale lithium-ion battery manufacturers. In order to meet the demand for moisture control of lithium-ion batteries, usually the moisture in the drying room needs to be controlled below 100ppm (volume fraction). The entire process of air dehumidification and heating requires a huge amount of electricity. Take a 16000m3 drying room as an example. The power demand is around 400kW.

The drying room is usually designed as a sealed space, and the moisture content of the intake air is usually controlled at about 15ppm. The flow of dry air is generally controlled by a moisture sensor to ensure that the air humidity of the entire drying room is maintained below 100ppm. This article will build a model to analyze the proportion of the investment and operating costs of the drying room in the cost of lithium-ion batteries.

The model is designed to have an annual production capacity of 10,000 electric vehicle power battery packs. The construction investment is divided into 6 years to be repaid. The space in the drying room is designed to be 16,000 cubic meters.

The air used at the front end of the drying room is 33°C and the relative humidity is 50% or 2.5vol%. First, this part of the air is cooled to 9°C to remove the moisture, and then this part of the dry gas will be discharged from the drying room. After mixing, the temperature of the mixed gas is 24℃ and the humidity is 0.07vol%. The mixed gas will be cooled to 10℃ again, and then most of the mixed gas (95%) will be sent back to the drying room. Part (5%) will be used as a cleaning airflow to leave the system, the humidity inside the drying room is controlled at about 15ppm, and the temperature is controlled at 25°C. Low cleaning flow (5%) is the advantage of this system, which can significantly reduce gas cooling and heating energy consumption.

The moisture in the drying room mainly comes from the human body, the moisture contained in the negative electrode, the gas brought in by the air shower room switch, etc., and the gas flow rate needs to be designed accordingly to ensure that the humidity of the gas flowing out of the drying room is controlled at 100 ppm or lower. In order to meet the above requirements, the gas flow must be controlled at 20m3/s, and the residence time of the drying gas in the drying room is 13.6min.

The application of the air shower here is to remove the dust on the staff entering the workshop, which is one of the impossible equipment. It is estimated that the heat generation power in the drying room is 250kW, so it is necessary to ensure that the temperature of the entering drying gas is 14°C, so as to ensure that the temperature of the gas from the drying room is around 25.

So let's simply calculate the energy consumption power required in the process of running in the drying room. The main chiller power of the drying unit is 426kW, plus the total cooling power of the front-end pre-cooling is 483kW. Assuming the power factor is 3.5, then The total cooling power is 138kW, and the total fan power is 167kW. Therefore, the total cooling and fan power is 305kW. The heating power is mainly concentrated in the rear heating 63kW and the dehumidification wheel's regenerative heating power 30kW, so the total operating power of the drying unit is 398kW.

If considering that the refrigeration and fan power are supplied by natural gas, and the efficiency of natural gas is 0.4, the total power of the drying unit becomes 856kW.

The basic cost of such a drying room includes the equipment cost of 74,1000 U.S. dollars, the annual electricity and natural gas cost of about 150,000 U.S. dollars, the labor cost (14 people as an example) about 78,000 U.S. dollars, and the utility cost about 180,000 U.S. dollars.

This is only the investment cost of the drying room, excluding the equipment used for battery production in the drying room, such as winding machines, filling machines, sealing machines and other equipment require huge investment. The homogenization, coating, rolling and slitting equipment of lithium-ion battery electrodes are all in the millions at every turn, so the lithium-ion battery industry is not only a technology-intensive industry, but also a capital-intensive industry. Investment in the lithium battery industry Need a solid financial foundation and strong technical support.

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