CN114396798A - Lithium battery material sintering atmosphere furnace based on circulation cooling and circulation cooling method thereof - Google Patents
Lithium battery material sintering atmosphere furnace based on circulation cooling and circulation cooling method thereof Download PDFInfo
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- CN114396798A CN114396798A CN202111525194.3A CN202111525194A CN114396798A CN 114396798 A CN114396798 A CN 114396798A CN 202111525194 A CN202111525194 A CN 202111525194A CN 114396798 A CN114396798 A CN 114396798A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
- F27B17/0083—Chamber type furnaces with means for circulating the atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/0005—Cooling of furnaces the cooling medium being a gas
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Abstract
The invention discloses a lithium battery material sintering atmosphere furnace based on circulating cooling and a circulating cooling method thereof, and the lithium battery material sintering atmosphere furnace comprises a furnace body and a gas circuit system, wherein an upper heating element and a lower heating element are arranged in a furnace chamber of the furnace body, the gas circuit system comprises a main gas inlet pipe, an exhaust pipe and a circulating cooling pipe, an outlet of the main gas inlet pipe is communicated with the furnace chamber, 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 gas inlet pipe, 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, high-temperature gas in the furnace chamber enters the circulating cooling pipe, the high-temperature gas is introduced into the furnace chamber through the main gas inlet pipe after being cooled by the heat exchanger to form internal circulation, a sagger is swept, and the temperature of materials is reduced. The invention utilizes the internal circulation of the process gas to accelerate the convection of the gas in the furnace chamber, improves the cooling rate, saves the process time, saves the consumption of the process gas and greatly reduces the cost.
Description
Technical Field
The invention relates to lithium battery material sintering equipment, in particular to a lithium battery material sintering atmosphere furnace based on circulating cooling and a circulating cooling method thereof.
Background
In recent years, with the rapid development of new energy industry, the market demand of lithium ion batteries is increasing in a blowout manner, and meanwhile, the production process of lithium battery materials is continuously improved and updated, and develops towards the trend of high energy density, cycle life and safety and reliability, so that the research on the sintering process is more and more important.
At present, an atmosphere box type furnace (also called as a batch furnace, namely, a previous batch of products are taken out after being sintered in the furnace and then a next batch of products are sintered again) is generally adopted for carrying out a lithium battery material sintering test, and the equipment mainly depends on cold process gas continuously introduced into a hearth to carry out forced convection heat exchange and natural convection heat dissipation on the surface of a furnace body during cooling. However, in order to achieve good heat insulation performance and reduce heating power consumption and surface temperature, a heat insulation layer with sufficient thickness is generally designed on the outside of the box-type furnace, so that heat dissipation of the equipment is slow when the equipment is cooled, the temperature reduction time of more than one day is usually required for sintering a furnace product, the temperature reduction time occupies about 70% of the whole process time, the production period is prolonged, and meanwhile, the cost is greatly increased by a large amount of process gas consumed during cooling.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the lithium battery material sintering atmosphere furnace based on circulation cooling and the circulation cooling method thereof, wherein the convection of gas in the furnace chamber is accelerated by utilizing the internal circulation of the process gas, the cooling rate is improved, the process time is saved, the consumption of the process gas is reduced, and the cost is greatly reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a lithium battery material sintering atmosphere stove based on circulative cooling, includes furnace body and gas circuit system, be equipped with heating element and lower heating element in the furnace chamber of furnace body, the gas circuit system includes main intake pipe, blast pipe and circulative cooling pipe, the export and the furnace chamber intercommunication of main intake pipe, the entry and the furnace chamber intercommunication of blast pipe, circulative cooling pipe's entry and furnace chamber intercommunication, export and main intake pipe intercommunication, the last heat exchanger that is equipped with of circulative cooling pipe.
As a further improvement of the technical scheme, the circulating cooling pipe is also provided with a circulating fan and a circulating switch valve.
As a further improvement of the above technical scheme, the gas circuit system further comprises a pressure regulating branch, an inlet of the pressure regulating branch is connected with the circulating cooling pipe, and a pressure regulating valve is arranged on the pressure regulating branch; an exhaust valve is arranged at the outlet of the exhaust pipe.
As a further improvement of the above technical scheme, a pressure equalizing chamber is arranged on the main air inlet pipe, an outlet of the circulating cooling pipe is communicated with the pressure equalizing chamber, the air path system further comprises a bottom air inlet branch pipe and at least one side air inlet branch pipe, inlets of the bottom air inlet branch pipe and the side air inlet branch pipe are connected with the pressure equalizing chamber, an outlet of the bottom air inlet branch pipe is arranged at the bottom of the furnace chamber, and an outlet of the side air inlet branch pipe is arranged at the side of the furnace chamber.
As a further improvement of the above technical solution, the furnace chamber is provided with a bearing guide rail and a pier for supporting the bearing guide rail, the pier is arranged at the bottom of the furnace chamber, the upper heating element is arranged above the bearing guide rail, and the lower heating element is arranged below the bearing guide rail.
As a further improvement of the technical scheme, a partition beam is arranged at the top of the furnace chamber, supporting steps I are respectively arranged on two sides of the partition beam, supporting steps II are respectively arranged on the side walls of two sides of the furnace chamber, upper supporting plates are supported on the supporting steps I and the supporting steps II which are oppositely arranged, and each upper supporting plate is provided with a heating element; the support device is characterized in that support steps III are arranged on two sides of the pier, support steps IV are arranged on the side walls of the two sides of the furnace chamber, lower support plates are arranged between the support steps III and the support steps IV which are arranged oppositely, and a lower heating element is placed on each lower support plate.
As the further improvement of the technical scheme, the heating chamber is enclosed between the upper supporting plate, the separation beam, the side wall of the furnace chamber and the top of the furnace chamber, the upper supporting plate is provided with the upper vent holes communicated with the furnace chamber and the heating chamber, the lower supporting plate, the pier, the side wall of the furnace chamber and the bearing guide rail are enclosed into the lower heating chamber, the lower supporting plate, the pier, the side wall of the furnace chamber and the bottom of the furnace chamber are enclosed into the air inlet chamber, the lower supporting plate is provided with the lower vent holes communicated with the lower heating chamber and the air inlet chamber, the lower heating chamber is communicated with the furnace chamber, the bottom air inlet branch pipe is communicated with the air inlet chamber, the top of the furnace chamber is provided with the exhaust chamber, and the upper heating chamber is communicated with the exhaust chamber.
As a further improvement of the technical scheme, the inner side wall of the furnace chamber is provided with an upper heating element through hole and a lower heating element through hole, the outer sides of the upper heating element through hole and the lower heating element through hole are respectively provided with an upper heating sealing box and a lower heating sealing box, the number of the side air inlet branch pipes is four, and outlets of the two side air inlet branch pipes are respectively connected with the upper heating sealing box and the lower heating sealing box.
As a further improvement of the technical scheme, the furnace body comprises a furnace shell, a heat preservation layer and a lining, the lining is enclosed into the furnace cavity, the heat preservation layer is arranged between the lining and the furnace shell, and the top of the lining is provided with an exhaust hole for communicating the upper heating cavity with the exhaust cavity.
The circulation cooling method of the lithium battery material sintering atmosphere furnace based on circulation cooling comprises the following steps:
when the sintering atmosphere furnace is cooled, the exhaust pipe is closed, the circulating cooling pipe is opened, high-temperature gas in the furnace chamber enters the circulating cooling pipe, is cooled by the heat exchanger and then enters the furnace chamber through the main air inlet pipe, internal circulation is formed, the saggar is swept, and the material cooling is realized.
Compared with the prior art, the invention has the advantages that:
according to the lithium battery material sintering atmosphere furnace based on circulation cooling and the circulation cooling method thereof, when a product is cooled, high-temperature gas in the furnace is pumped out and cooled by the heat exchanger and then is introduced into the furnace chamber again, and internal circulation of process gas is utilized, so that convection of gas in the furnace chamber is accelerated, the cooling rate is improved, the process time is saved, the problem of low cooling rate of a traditional atmosphere box type furnace is solved, meanwhile, the circulation utilization of the process gas is realized, the gas consumption is greatly reduced, the consumption of the process gas is saved, the cost is greatly reduced, and the sintering atmosphere in the furnace can be fully ensured.
Drawings
FIG. 1 is a schematic sectional structure diagram of a lithium battery material sintering atmosphere furnace based on circulation cooling of the invention.
Fig. 2 is a view a-a of fig. 1.
The reference numerals in the figures denote:
1. a furnace body; 11. a furnace shell; 12. a heat-insulating layer; 13. a liner; 131. an exhaust hole; 14. a furnace door; 15. plugging the brick; 2. a furnace chamber; 201. the upper heating element passes through the aperture; 202. the lower heating element passes through the aperture; 21. a second supporting step; 22. a fourth supporting step; 23. an air inlet cavity; 24. an exhaust chamber; 25. an upper heating sealing box; 26. a lower heating seal box; 3. a heating element; 31. an upper heating element; 32. a lower heating element; 33. an upper heating cavity; 34. a lower heating cavity; 35. a thermocouple; 4. a main air inlet pipe; 41. a pressure equalizing cavity; 42. a bottom intake manifold; 43. a side intake branch pipe; 5. an exhaust pipe; 51. an exhaust valve; 6. a circulating cooling pipe; 61. a heat exchanger; 62. a circulating fan; 63. a circulation on-off valve; 7. a voltage regulating branch circuit; 71. a pressure regulating valve; 81. a load bearing rail; 82. a bridge pier; 821. a third supporting step; 83. a spacer beam; 831. a first supporting step; 84. an upper supporting plate; 841. an upper vent; 85. a lower supporting plate; 851. a lower vent; 9. and (5) sagger.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
As shown in fig. 1 and fig. 2, the lithium battery material sintering atmosphere furnace based on circulation cooling of the present embodiment includes a furnace body 1 and a gas path system, an upper heating element 31 and a lower heating element 32 are disposed in a furnace chamber 2 of the furnace body 1, a sagger 9 is disposed in the furnace chamber 2, and the sagger 9 is located between the upper heating element 31 and the lower heating element 32. The sagger 9 is used to contain the sintered product. The gas path system comprises a main gas inlet pipe 4, a gas outlet pipe 5 and a circulating cooling pipe 6, wherein an outlet of the main gas inlet pipe 4 is communicated with the furnace chamber 2, an inlet of the gas outlet pipe 5 is communicated with the furnace chamber 2, an inlet of the circulating cooling pipe 6 is communicated with the furnace chamber 2, an outlet of the circulating cooling pipe 6 is communicated with the main gas inlet pipe 4, and a heat exchanger 61 is arranged on the circulating cooling pipe 6.
The lithium battery material sintering atmosphere furnace is mainly used for sintering tests of novel lithium battery anode and cathode materials, the sintering temperature ranges from 700 ℃ to 1500 ℃, and the sintering atmosphere (namely process gas) is mainly mixed gas of oxygen, nitrogen, argon and the like. The lithium battery material sintering atmosphere furnace is closed, and after the sintering product is sintered once (at high temperature and low temperature), the sintering product is taken out, and the next batch of sintering product is placed again for continuous sintering.
When the sintering atmosphere furnace is operated to high-temperature sintering, the upper heating element 31 and the lower heating element 32 heat the furnace chamber 2, at the moment, the main air inlet pipe 4 and the exhaust pipe 5 are opened, the circulating cooling pipe 6 is closed, process gas enters the furnace chamber 2 from the main air inlet pipe 4 and is fully contacted with a sintered product, and then the sintered gas is discharged from the exhaust pipe 5.
When the sintering atmosphere furnace is operated to cool down, the heating is stopped, the exhaust pipe 5 is closed at the moment, the circulating cooling pipe 6 is opened, the exhaust pipe 5 is closed, the circulating cooling pipe 6 is opened, high-temperature gas in the furnace chamber 2 enters the circulating cooling pipe 6, the high-temperature gas is cooled by the heat exchanger 61 and then enters the furnace chamber 2 through the main gas inlet pipe 4, internal circulation is formed, the sagger 9 is swept, and the material cooling is realized. Among them, the heat exchanger 61 is preferably cooled by cooling water that cools the high-temperature gas in the circulating cooling pipe 6.
According to the rapid cooling atmosphere furnace for the lithium battery material sintering test, when a product is cooled, high-temperature gas in the furnace is pumped out and cooled by the heat exchanger 61 and then is introduced into the furnace chamber 2 again, and internal circulation of process gas is utilized, so that convection of the gas in the furnace chamber 2 is accelerated, the cooling rate is improved, the process time is saved, the problem of low cooling rate of a traditional atmosphere box type furnace is solved, the cyclic utilization of the process gas is realized, the gas consumption is greatly reduced, the consumption of the process gas is reduced, the cost is greatly reduced, and the sintering atmosphere in the furnace can be fully ensured.
It should be noted that, when the atmosphere furnace is cooled, the main air inlet pipe 4 may be opened or closed, but in order to avoid negative pressure in the furnace chamber 2, the main air inlet pipe 4 is opened to supply air into the furnace chamber 2 and the cooling circulation pipe 6, and the amount of air supply is controlled by the pressure in the cooling circulation pipe 6, based on this, the air path system further needs to be provided with a pressure regulating branch 7, the inlet of the pressure regulating branch 7 is connected with the cooling circulation pipe 6, the pressure regulating branch 7 is provided with a pressure regulating valve 71, and the pressure regulating valve 71 automatically regulates the opening degree according to the pressure in the furnace, so as to constantly maintain the pressure in the furnace chamber stable, and ensure the sintering quality of the product.
In this embodiment, an exhaust valve 51 is provided at the outlet of the exhaust pipe 5. The exhaust valve 51 is used to directly exhaust the gas in the furnace chamber 2 from the exhaust pipe 5 when the exhaust valve 51 is opened, and the gas in the furnace chamber 2 enters the circulating cooling pipe 6 when the exhaust valve 51 is closed.
In this embodiment, the circulation cooling pipe 6 is further provided with a circulation fan 62 and a circulation switch valve 63. The opening and closing of the circulation cooling pipe 6 is controlled by the circulation opening and closing valve 63. The circulating fan 62 is used for exhausting air, so that hot air in the furnace chamber 2 quickly enters the circulating cooling pipe 6, the circulating fan 62 is a fully-sealed fan, the influence of air sucked in a pipeline on the atmosphere in the furnace is prevented, the circulating fan has a frequency conversion function, and the circulating air quantity is regulated in a variable frequency mode, so that the cooling rate is controlled.
In this embodiment, the cavity 2 is provided with a support rail 81 and a pier 82 for supporting the support rail 81, the pier 82 is disposed at the bottom of the cavity 2, the upper heating element 31 is disposed above the support rail 81, and the lower heating element 32 is disposed below the support rail 81. The sagger 9 is placed on the bearing guide rail 81, and an oven door 14 is arranged on one side of the sintering atmosphere furnace, and the sagger 9 can be put in or taken out by opening the oven door 14.
In this embodiment, the upper heating element 31 and the lower heating element 32 are silicon-molybdenum rods, which are suitable for the sintering temperature condition of 700-1500 ℃, and under such a high temperature condition, the cooling of the sintering atmosphere furnace is difficult to be realized by using a conventional water-cooling tube, because the normal temperature water-cooling tube bears such a high temperature. In this embodiment, the inner side wall of the cavity 2 is provided with an upper heating element passing hole 201 and a lower heating element passing hole 202, and the outer sides of the upper heating element passing hole 201 and the lower heating element passing hole 202 are respectively provided with an upper heat sealing box 25 and a lower heat sealing box 26. The terminals of the upper heating element 31 (the lower heating element 32) are led out from the side surface of the furnace body through holes, and a heating sealing box is arranged outside for sealing.
In this embodiment, the main air inlet pipe 4 is provided with a pressure equalizing chamber 41, the outlet of the cooling circulation pipe 6 is communicated with the pressure equalizing chamber 41, the air path system further includes a bottom air inlet branch pipe 42 and at least one side air inlet branch pipe 43, the inlets of the bottom air inlet branch pipe 42 and the side air inlet branch pipe 43 are connected with the pressure equalizing chamber 41, the outlet of the bottom air inlet branch pipe 42 is arranged at the bottom of the furnace chamber 2, and the outlet of the side air inlet branch pipe 43 is arranged at the side of the furnace chamber 2. The number of the side air inlet branch pipes 43 is preferably four, two outlets of the side air inlet branch pipes 43 are respectively connected with the upper heating seal box 25 and the lower heating seal box 26, and two side air inlet branch pipes 43 are arranged between the upper heating seal box 25 and the lower heating seal box 26, one on the left side and one on the right side, and are directly communicated with the oven cavity 2. The bottom air inlet branch pipe 42 and the side air inlet branch pipe 43 are arranged, so that the process gas can enter the furnace chamber 2 in a dispersing way during high-temperature sintering, and the air inlet uniformity in the furnace chamber 2 is improved. The pressure equalizing chamber 41 is arranged so that the gas entering the furnace chamber 2 is first mixed in the furnace chamber 2 and then enters each branch pipe at the same pressure, thereby further improving the gas inlet uniformity of the furnace chamber 2.
In this embodiment, the top of the oven cavity 2 is provided with a partition beam 83, two sides of the partition beam 83 are provided with a first supporting step 831, two side walls of the oven cavity 2 are provided with a second supporting step 21, the first supporting step 831 and the second supporting step 21 which are arranged oppositely support upper supporting plates 84, and each upper supporting plate 84 is provided with an upper heating element 31; support steps three 821 are arranged on two sides of the pier 82, support steps four 22 are arranged on side walls of two sides of the furnace chamber 2, lower support plates 85 are arranged between the support steps three 821 and the support steps four 22 which are oppositely arranged, and a lower heating element 32 is arranged on each lower support plate 85.
In this embodiment, the upper supporting plate 84, the partition beam 83, the upper heating cavity 33 is defined between the side wall of the furnace cavity 2 and the top of the furnace cavity 2, the upper supporting plate 84 is provided with upper vent holes 841 communicating the furnace cavity 2 with the upper heating cavity 33, the lower supporting plate 85, the bridge pier 82, the lower heating cavity 34 is defined between the side wall of the furnace cavity 2 and the bearing guide rail 81, the lower supporting plate 85, the bridge pier 82, the side wall of the furnace cavity 2 and the bottom of the furnace cavity 2 define the air intake cavity 23, the lower supporting plate 85 is provided with lower vent holes 851 communicating the lower heating cavity 34 and the air intake cavity 23, the lower heating cavity 34 is communicated with the furnace cavity 2, the bottom air intake branch pipe 42 is communicated with the air intake cavity 23, the top of the furnace cavity 2 is provided with the exhaust cavity 24, and the upper heating cavity 33 is communicated with the exhaust cavity 24.
In this embodiment, the furnace body 1 includes a furnace shell 11, a heat insulating layer 12 and a lining 13, the lining 13 encloses a furnace chamber 2, the heat insulating layer 12 is disposed between the lining 13 and the furnace shell 11, the top of the lining 13 is a detachable structure, and the lining is provided with an exhaust hole 131 for communicating the upper heating chamber 33 and the exhaust chamber 24. The inner lining 13 is provided with an opening facing to the oven door 14, and the inner side surface of the oven door 14 is provided with a heat insulation plug brick 15 for sealing the heat insulation opening. The lining 13, the pier 82, the partition beam 83, the upper supporting plate 84, the lower supporting plate 85 and the plug brick 15 are all made of corundum materials, have good high temperature resistance and corrosion resistance, can effectively resist corrosive volatile matters generated in the sintering process of lithium battery materials, are made of aluminum silicate fiber materials, have good heat insulation performance, can reduce the surface temperature and heat loss of equipment, and are made of high-purity corundum materials, so that the bearing guide rail 81 has better hardness and wear resistance compared with the conventional corundum materials, and can effectively prevent the sagger 9 from being worn when being repeatedly pushed into the furnace chamber 2. The furnace shell 11 is a fully-sealed square shell formed by welding carbon steel plates, and a square furnace chamber is formed by heat insulation materials and lining materials built inside. The upper heating element and the lower heating element are respectively provided with a thermocouple 35 for independent temperature control, and the thermocouple 35 is arranged in the middle of the furnace chamber 2 for monitoring the temperature of the furnace chamber, so that uniform heating and accurate temperature control are fully ensured.
The working principle of the whole sintering atmosphere furnace is as follows: a process gas source is respectively and uniformly introduced into the furnace chamber 2 from the bottom, two sides and four ways of a heating sealing box of the furnace chamber 2 through a pressure equalizing cavity 41, the purity of the sintering atmosphere in the furnace is fully ensured, a plurality of air holes are arranged on an upper supporting plate, a lower supporting plate and the top of a lining, the gas is uniformly discharged out of the furnace body through an exhaust pipe 5 after being converged at the top of the furnace chamber 2, the tail part of the exhaust pipe 5 is connected with an exhaust valve 51 to control the exhaust, and the other branch of the exhaust pipe 5 is provided with a circulating cooling pipe 6, when the box-type furnace runs to be cooled, the exhaust valve 51 at the top is closed, a circulating fan 62 and a circulating switch valve 63 are opened, the pipeline is fully closed, the process gas is internally circulated through the circulating cooling pipe 6, the high-temperature gas in the furnace is continuously extracted by the circulating fan 62, the high-temperature gas is fully cooled by a heat exchanger 61 and then introduced into the furnace chamber 2 through an air inlet pipe, a sagger 9 is swept to realize the temperature reduction of materials, and a pressure regulating valve 71 is arranged behind the circulating fan 62, the opening degree is automatically adjusted according to the pressure in the furnace, the pressure in the furnace chamber is constantly kept stable, and the sintering quality of products is ensured. The cooling water in the heat exchanger 61 enters from the bottom and goes out from the top, and the flow direction of the cooling water is opposite to that of the gas, so that countercurrent heat exchange is formed, and the cooling efficiency is improved.
The sintering atmosphere furnace provided by the invention simulates a large-scale production push plate furnace structure, adopts an upper and lower partition heating mode, and a guide rail is arranged in the middle to support products, so that the fully-sealed furnace body structure is designed to meet the requirement of lithium battery material sintering under the atmosphere condition, and the sintering atmosphere furnace is suitable for test research before large-scale production and is convenient for conversion of research results from the test to the large-scale production.
The circulating cooling method of the lithium battery material sintering atmosphere furnace based on circulating cooling comprises the following steps:
when the sintering atmosphere furnace is cooled, the exhaust pipe 5 is closed, the circulating cooling pipe 6 is opened, high-temperature gas in the furnace chamber 2 enters the circulating cooling pipe 6, is cooled by the heat exchanger 61 and then enters the furnace chamber 2 through the main air inlet pipe 4 to form internal circulation, the sagger 9 is swept, and the material cooling is realized.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. The utility model provides a lithium battery material sintering atmosphere stove based on circulative cooling, a serial communication port, includes furnace body (1) and gas circuit system, be equipped with heating element (31) and lower heating element (32) in furnace chamber (2) of furnace body (1), the gas circuit system includes main intake pipe (4), blast pipe (5) and circulative cooling pipe (6), the export and furnace chamber (2) intercommunication of main intake pipe (4), the entry and furnace chamber (2) intercommunication of blast pipe (5), the entry and furnace chamber (2) intercommunication, export and main intake pipe (4) intercommunication of circulative cooling pipe (6), be equipped with heat exchanger (61) on circulative cooling pipe (6).
2. The lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in claim 1, characterized in that the circulation cooling pipe (6) is further provided with a circulation fan (62) and a circulation switch valve (63).
3. The lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in claim 1, wherein the gas circuit system further comprises a pressure regulating branch (7), an inlet of the pressure regulating branch (7) is connected with the circulation cooling pipe (6), and a pressure regulating valve (71) is arranged on the pressure regulating branch (7); an outlet of the exhaust pipe (5) is provided with an exhaust valve (51).
4. A lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in any one of claims 1 to 3, characterized in that the main air inlet pipe (4) is provided with a pressure equalizing chamber (41), the outlet of the circulation cooling pipe (6) is communicated with the pressure equalizing chamber (41), the air path system further comprises a bottom air inlet branch pipe (42) and at least one side air inlet branch pipe (43), the inlets of the bottom air inlet branch pipe (42) and the side air inlet branch pipe (43) are connected with the pressure equalizing chamber (41), the outlet of the bottom air inlet branch pipe (42) is arranged at the bottom of the furnace chamber (2), and the outlet of the side air inlet branch pipe (43) is arranged at the side of the furnace chamber (2).
5. A lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in claim 4, characterized in that the furnace chamber (2) is provided with a bearing guide rail (81) and a pier (82) for supporting the bearing guide rail (81), the pier (82) is arranged at the bottom of the furnace chamber (2), the upper heating element (31) is arranged above the bearing guide rail (81), and the lower heating element (32) is arranged below the bearing guide rail (81).
6. The lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in claim 5, characterized in that the top of the furnace chamber (2) is provided with a partition beam (83), both sides of the partition beam (83) are provided with a first supporting step (831), the side walls of both sides of the furnace chamber (2) are provided with a second supporting step (21), the first supporting step (831) and the second supporting step (21) which are arranged oppositely support upper supporting plates (84), and each upper supporting plate (84) is provided with an upper heating element (31); support step three (821) is arranged on two sides of the pier (82), support step four (22) is arranged on the side walls of two sides of the furnace chamber (2), lower supporting plates (85) are arranged between the support step three (821) and the support step four (22) which are arranged oppositely, and lower heating elements (32) are placed on each lower supporting plate (85).
7. The lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in claim 6, wherein the upper supporting plate (84), the partition beam (83), the side wall of the furnace chamber (2) and the top of the furnace chamber (2) form an upper heating chamber (33), the upper supporting plate (84) is provided with upper vent holes (841) communicating the furnace chamber (2) with the upper heating chamber (33), the lower supporting plate (85), the bridge piers (82), the side wall of the furnace chamber (2) and the bearing guide rails (81) form a lower heating chamber (34), the lower supporting plate (85), the bridge piers (82), the side wall of the furnace chamber (2) and the bottom of the furnace chamber (2) form an air inlet chamber (23), the lower supporting plate (85) is provided with lower vent holes (851) communicating the lower heating chamber (34) with the air inlet chamber (23), the lower heating chamber (34) is communicated with the furnace chamber (2), and the bottom air inlet branch pipe (42) is communicated with the air inlet chamber (23), the oven is characterized in that an exhaust cavity (24) is arranged at the top of the oven cavity (2), and the upper heating cavity (33) is communicated with the exhaust cavity (24).
8. A lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in claim 6, characterized in that the inner side wall of the furnace chamber (2) is provided with an upper heating element passing hole (201) and a lower heating element passing hole (202), the outer sides of the upper heating element passing hole (201) and the lower heating element passing hole (202) are respectively provided with an upper heating sealing box (25) and a lower heating sealing box (26), the number of the side air inlet branch pipes (43) is four, and the outlets of two side air inlet branch pipes (43) are respectively connected with the upper heating sealing box (25) and the lower heating sealing box (26).
9. The lithium battery material sintering atmosphere furnace based on circulation cooling as claimed in claim 7, wherein the furnace body (1) comprises a furnace shell (11), a heat preservation layer (12) and a lining (13), the lining (13) encloses the furnace chamber (2), the heat preservation layer (12) is arranged between the lining (13) and the furnace shell (11), and the top of the lining (13) is provided with an exhaust hole (131) for communicating the upper heating cavity (33) with the exhaust cavity (24).
10. A method of cyclically cooling a lithium battery material sintering atmosphere furnace based on cyclic cooling according to any one of claims 1 to 9, comprising the steps of:
when the sintering atmosphere furnace is cooled, the exhaust pipe (5) is closed, the circulating cooling pipe (6) is opened, high-temperature gas in the furnace chamber (2) enters the circulating cooling pipe (6), is cooled by the heat exchanger (61) and then is introduced into the furnace chamber (2) through the main air inlet pipe (4), internal circulation is formed, the sagger (9) is swept, and the material cooling is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111525194.3A CN114396798A (en) | 2021-12-14 | 2021-12-14 | Lithium battery material sintering atmosphere furnace based on circulation cooling and circulation cooling method thereof |
Applications Claiming Priority (1)
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| CN116960345A (en) * | 2023-08-09 | 2023-10-27 | 山东兴丰新能源科技有限公司 | Device for preparing battery cathode material by utilizing box-type furnace and preparation method thereof |
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