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Application of air shower room in lithium-ion battery drying room
Application of air shower room in lithium-ion battery drying roomApplication of air shower room in lithium-ion battery drying room: The cost ratio of air shower room in lithium-ion battery drying room is very small, only a small part of it, but it is a unique piece of equipment.Air showers are due to the rapid development of the electric vehicle industry in China, which has created a huge market demand for lithium-ion batteries. Many battery manufacturers have also expanded their production capacity. Some companies have also taken advantage of this shareholder trend to enter the lithium-ion battery industry. As an industry People, the ion battery industry is not as beautiful as it seems, especially for lithium-ion battery factories, which are also a big expense. Today zijing technology mainly introduces to you the application of air showers in the drying rooms of lithium-ion battery factories. Regarding the air shower room, we have also introduced it before 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 requires huge investment in initial construction but also consumes huge amounts of money in later operations. The investment and operating costs of the drying room, an important part of the lithium-ion pool production line, are very huge. The working voltage of lithium-ion batteries can be as high as 4.2V, so the electrolyte can only use organic systems. The commonly used lithium salt is generally lithium hexafluorophosphate, which makes the entire lithium-ion battery production process very sensitive to moisture. Therefore, the drying room is used for lithium-ion batteries. , especially for large-scale lithium-ion battery manufacturers. To meet the needs of lithium-ion batteries for moisture control, the moisture in the drying room usually needs to be controlled below 100 ppm (volume fraction). The entire process of air dehumidification and heating requires a huge amount of electricity. Taking a 16,000m3 drying room as an example, usually its power requirement is around 400kW. The drying room is usually designed as a sealed space, and the moisture content of the incoming air is usually controlled at about 15 ppm. The flow of dry air is generally controlled through a moisture sensor to ensure that the air humidity in the entire drying room is maintained below 100 ppm. This article will establish a model to analyze the proportion of dry room investment and operating costs 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 will be repaid in six years, and the drying room space is designed to be 16,000 cubic meters. The gas used at the front end of the drying room is air with a relative humidity of 33°C and a relative humidity of 50% or 2.5vol%. First, this part of the air is cooled to 9°C to remove the moisture. Then this part of the dry gas will be discharged from the drying room. The gases are mixed. The mixed gas temperature is 24°C and the humidity is 0.07vol%. The mixed gas will be cooled to 10°C again, and then most of the mixed gas (95%) will be sent back to the drying room. Part (5%) will be used as cleaning airflow to leave the system. The humidity inside the drying room is controlled at about 15 ppm, and the temperature is controlled at 25°C. The low cleaning flow rate (5%) is an 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 switch, etc. The gas flow needs to be designed accordingly to ensure that the humidity of the gas flowing out of the drying room is controlled at 100 or lower. To meet the above requirements, the gas flow rate must be controlled at 20m3/s, and the residence time of dry gas in the drying room is 13.6 min. The air shower is used here to remove dust when workers enter the workshop, and it is one of the impossible equipment. The heat generation power in the drying room is expected to be 250kW, so it is necessary to ensure that the temperature of the incoming drying gas is 14°C, thereby ensuring that the temperature of the gas from the drying room is around 25°C. So now let’s simply calculate the energy consumption required during operation in the drying room. The main refrigeration power of the drying unit is 426kW, plus the total refrigeration power of the front-end pre-cooling is 483kW. Assuming that the power coefficient is 3.5, then The total refrigeration electric power is 138kW and the total fan power is 167kW, so the total refrigeration and fan power is 305kW. The heating power is mainly concentrated in the rear-end heating 63kW and the regenerative heating power of the dehumidification wheel is 30kW, so the total operating power of the drying unit is 398kW. If it is considered 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 equipment costs of $74,100, annual electricity and natural gas costs of approximately $150,000, labor costs (for example, 14 people) of approximately $78,000, and utility costs of approximately $180,000. This is only the investment cost of the drying room. It does not include the equipment used for battery production inside the drying room. Equipment such as winding machines, liquid injection machines, sealing machines, etc. all require huge investments. The equipment for homogenizing, coating, rolling, and cutting of lithium-ion battery electrodes costs millions. Therefore, the lithium-ion battery industry is not only a technology-intensive industry but also a capital-intensive industry. Investing in the lithium battery industry requires a strong financial foundation and strong technical support. |
