Lithium battery material sintering atmosphere furnace based on circulating cooling and circulating cooling method thereof

Abstract

The invention discloses a lithium battery material sintering atmosphere furnace based on circulating cooling and a circulating cooling method thereof.The lithium battery material sintering atmosphere furnace comprises a furnace body and a gas path system, an upper heating element and a lower heating element are arranged in a furnace cavity of the furnace body, the gas path system comprises a main gas inlet pipe, an exhaust pipe and a circulating cooling pipe, and an outlet of the main gas inlet pipe communicates with the furnace cavity; an inlet of the exhaust pipe is communicated with the furnace chamber, an inlet of the circulating cooling pipe is communicated with the furnace chamber, an outlet of the circulating cooling pipe is communicated with the main air inlet pipe, and a heat exchanger is arranged on the circulating cooling pipe. When the atmosphere furnace is cooled, the exhaust pipe is closed, the circulating cooling pipe is opened, and high-temperature gas in the furnace chamber enters the circulating cooling pipe, is cooled by the heat exchanger and then is introduced into the furnace chamber through the main air inlet pipe; and internal circulation is formed, the sagger is purged, and material cooling is achieved. By means of internal circulation of the process gas, convection of the gas in the furnace chamber is accelerated, the cooling rate is increased, the process time is saved, the consumption of the process gas is reduced, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to lithium battery material sintering equipment, in particular to a lithium battery material sintering atmosphere furnace based on circulation cooling and a circulation cooling method thereof. Background technique [0002] In recent years, with the rapid development of the new energy industry, the market demand for lithium-ion batteries has shown a blowout growth. At the same time, the production process of lithium battery materials is also constantly improving and updating, towards high energy density, cycle life and safety. The trend of reliability develops, which also makes the research on sintering process more and more important. [0003] At present, the sintering test of lithium battery materials generally uses an atmosphere box furnace (also called a batch furnace, that is, the last batch of products is taken out after sintering in the furnace, and then the next batch of products is re-sintered). Relying on the cold proces...

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Problems solved by technology

However, in order to achieve good thermal insulation performance and reduce heating power consumption and surface temperature, box-type furnaces generally design an insulation layer with sufficient thickness on the outside, which will cause the equipment to dissipate heat slowly when cooling down, and it usually takes more than a day to sinter a furnace product. The cooling time, which occupies about 70% of the entire process time, not only prolongs the production cycle, but also consumes a large amount of process gas during cooling, which greatly increases the cost

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