Vacuum tunnel furnace for dehydrating battery cells based on liquid bath heating or cooling

Abstract

The present invention relates to a vacuum tunnel furnace for dehydrating battery cells by heating or cooling based on a liquid bath method, comprising a vacuum chamber, a material rack for placing fixtures arranged in the vacuum chamber, a plurality of heat exchange plates arranged in the material rack, the heat exchange plates being connected to a liquid heater or a liquid refrigerator through a pipeline and dehydrating the battery cells placed on top by heating or cooling; a transport device is arranged in the vacuum chamber, the transport device, the material rack and a plurality of heat exchange plates constitute a storage-type fixed-point dehydration mechanism located in the vacuum chamber, and the battery cells complete fixed-point and timed heating or cooling in the vacuum chamber through the storage-type fixed-point dehydration mechanism. The present invention directly heats or cools the battery cells by contact with the liquid bath method in a vacuum environment, reduces energy consumption, prevents moisture resurgence of the battery cells, and has a short dehydration time and high consistency for the battery cells. The material rack is provided with a multi-layer dehydration chamber, and the material is automatically placed by the transport device, so as to realize automatic loading and unloading and automatic material placement in a storage-type flow-pulling operation, thereby reducing the floor space occupied.

Description

Technical Field

[0001] The invention relates to the technical field of battery cell production technology, and in particular to a vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method. Background Art

[0002] In the production process of soft-pack batteries, it is necessary to dehydrate the soft-pack batteries to control the water content of the soft-pack batteries. The Chinese invention patent with application number 201910622066.7 discloses a tunnel furnace dehydration device for recycling material carts and its production process. The invention uses material carts to load multi-layer batteries. The automatic loading and unloading of multi-layer batteries loaded by material carts is difficult, and the preheating chamber and vacuum chamber use hot air heating to heat the batteries, which results in uneven heating of the batteries inside the material cart and the batteries outside, resulting in inconsistent temperatures. At the same time, the battery dehydration time is too long, and air cooling is used during cooling, which makes the battery easy to regain moisture, making the battery dehydration effect unsatisfactory and energy consumption high. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a vacuum tunnel furnace for removing water from a battery cell by heating or cooling based on a liquid bath method. The present invention can be applied to processes that require control of ambient temperature, such as lithium batteries, sodium batteries, lithium sulfur batteries, aluminum batteries, and supercapacitors.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a vacuum tunnel furnace for dehydrating battery cells by heating or cooling based on a liquid bath method, comprising a vacuum chamber, wherein the vacuum chamber provides a negative pressure vacuum environment to extract water vapor formed after heating the water inside the battery cells, wherein the battery cells are loaded on a tray for circulation, wherein a material rack for placing a fixture loaded with the tray is provided in the vacuum chamber, wherein a plurality of heat exchange plates are provided on the material rack, wherein the heat exchange plates are connected to a liquid heater or a liquid cooler through a pipeline and dehydrate the battery cells placed thereon by heating or cooling; wherein a conveying device for transferring the battery cells between a feed port of the vacuum chamber, a heat exchange plate on the material rack and a discharge port of the vacuum chamber is provided in the vacuum chamber, wherein the conveying device, the material rack and the plurality of heat exchange plates constitute a warehouse-type fixed-point dehydration mechanism located in the vacuum chamber, wherein the battery cells complete fixed-point and timed heating or cooling in the vacuum chamber through the warehouse-type fixed-point dehydration mechanism.

[0005] In the above technical solution, the clamp is provided with a through groove with a hollow bottom for placing a tray, the outer wall of the tray is provided with a stop block, and the inner wall of the through groove is provided with a positioning block that contacts the positioning block to lift the tray when the clamp and the tray are transported. During the dehydration process of the battery cells, the clamp is mounted on the material rack and suspended above a heat exchange plate without contacting the heat exchange plate, and the heat exchange plate is in contact with the bottom of the tray.

[0006] In the above technical solution, multiple layers of dewatering bins are vertically arranged on the material rack, and multiple heat exchange plates are arranged side by side on each layer of dewatering bins. The conveying device includes a vertical loading assembly, multiple horizontal conveying assemblies and a vertical unloading assembly. The multiple horizontal conveying assemblies are respectively arranged in the corresponding layer of dewatering bins, and the vertical loading assembly and the vertical unloading assembly are respectively arranged on the feed port side and the discharge port side of the material rack; the clamp at the feed port is lifted to the height of one layer of the dewatering bin of the material rack by the vertical loading assembly and is connected and conveyed to one of the heat exchange plates of the dewatering bin of the layer by the horizontal conveying assembly of the layer to complete the fixed-point conveyance, and the clamp after dewatering is completed is conveyed to the vertical unloading assembly by the horizontal conveying assembly and is connected and conveyed to the unloading port by the vertical unloading assembly.

[0007] In the above technical solution, the transverse transport assembly includes a moving seat, a pallet for lifting the clamp, a guide rail and a rack laid along the material rack, the pallet is arranged on the moving seat in a liftable manner, and the moving seat is provided with a transverse moving motor that drives the moving seat to move along the guide rail through a transverse screw rod; the moving seat is provided with a lifting motor that drives the pallet to lift and lower through a lifting screw rod.

[0008] In the above technical solution, the vertical loading assembly and the vertical unloading assembly both include a column, a vertical screw rod, a driving motor and a top plate cooperating with the clamp. The two columns are symmetrically arranged on the outside of the material rack. The driving motor drives the top plate to move up and down along the column through the vertical screw rod arranged along the column.

[0009] In the above technical solution, the feed port and the discharge port of the vacuum bin are both provided with a transition bin which serves as a buffer between the vacuum bin and the external atmospheric environment to ensure the stability of the air pressure in the vacuum bin. The transition bin is respectively provided with a plug valve which is opened or closed by translation on the vacuum bin side and the external atmospheric environment side.

[0010] In the above technical scheme, a loading station and an unloading station are respectively arranged outside the feed port and the discharge port of the vacuum bin, and a fixture return transport line for the flow of fixtures is arranged between the loading station and the unloading station outside the vacuum bin. The fixture is loaded with a pallet by a robot at the loading station and unloaded by another robot at the unloading station. The fixture is moved in the vacuum bin by a handling device, and the loading station pushes the fixture into the feed port transition bin by a linear cylinder, and the unloading station pulls the fixture out of the discharge port transition bin by another linear cylinder.

[0011] In the above technical solution, the feeding direction of the clamp to the feed port transition bin and the vacuum bin at the loading station is perpendicular or parallel to the length direction of the clamp.

[0012] In the above technical solution, the vacuum chamber and transition chamber are connected to the corresponding vacuum system control valve and vacuum pump through pipelines.

[0013] In the above technical solution, a plurality of heat exchange plates are connected in series or in parallel through pipelines, and a liquid pump and a fluid control valve are provided between the plurality of heat exchange plates and the liquid heater or the liquid refrigerator.

[0014] The beneficial effects of the present invention are that the present invention has a reasonable structure, a novel design, and strong practicality. It adopts a warehouse-type fixed-point water removal mechanism to perform fixed-point and long-term heating or cooling of the battery cells in the vacuum bin to remove moisture from the battery cells. The battery cells are directly contact-heated or cooled by a liquid bath method under a vacuum environment, which reduces energy consumption. The battery cells are heated or cooled evenly, which can effectively prevent the battery cells from getting damp. The battery cells are dehydrated in a short time with high consistency. The material rack is provided with five layers of water removal bins, and eight heat exchange plates are arranged side by side in each layer of the water removal bin. The materials are automatically placed by the handling device, and the warehouse-type circulation operation of automatic loading and unloading and automatic material placement is realized, thereby reducing the floor space occupied. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the liquid water connection structure of the heat exchange plate.

[0017] Figure 3 It is a structural diagram of the material rack plane.

[0018] Figure 4 It is a schematic diagram of the structure of the tray and the fixture.

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure in which the tray and the fixture are placed on the heat exchange plate.

[0020] Figure 6 It is a schematic diagram of the vacuum pipeline structure.

[0021] Figure 7 It is a three-dimensional structural diagram of the material rack.

[0022] Figure 8 yes Figure 7 A schematic diagram of the enlarged structure of part A.

[0023] In the figure: 1. vacuum chamber, 11. feed port, 12. discharge port, 13. material rack, 14. vacuum pump, 15. rack, 21. loading station, 22. unloading station, 23. three-axis manipulator, 3. reflux transport line, 31. turntable, 4. transition chamber, 51. first gate valve, 52. second gate valve, 53. third gate valve, 54. fourth gate valve, 6. fixture, 61. through groove, 62. stopper, 7. tray, 71. positioning block, 8. heat exchange plate, 81. fluid control valve, 82. liquid pump, 83. liquid heater, 84. liquid refrigerator, 91. Vertical loading assembly, 92. Vertical unloading assembly, 93. Column, 94. Top plate, 95. Driving motor, 96. Horizontal transport assembly, 97. Moving seat, 98. Horizontal moving motor, 99. Pallet, 991. Lifting motor, 10. Battery cell. DETAILED DESCRIPTION

[0024] Specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] like Figure 1-8 As shown, a vacuum tunnel furnace for dehydrating battery cells by heating or cooling based on a liquid bath method comprises a vacuum chamber 1, which provides a negative pressure vacuum environment to extract water vapor formed by heating the water inside the battery cells 10, and the battery cells 10 are loaded on trays 7 for circulation. A material rack 13 for placing a fixture loaded with the tray is provided in the vacuum chamber 1, and a plurality of heat exchange plates 8 are provided on the material rack 13. The heat exchange plates 8 are connected to a liquid heater 83 or a liquid cooler 84 through a pipeline and dehydrate the battery cells 10 placed thereon by heating or cooling; a conveying device for transferring the battery cells 10 between a feed port 11 of the vacuum chamber 1, the heat exchange plates 8 on the material rack 13, and a discharge port 12 of the vacuum chamber 1 is provided in the vacuum chamber 1, and the conveying device, the material rack 13, and the plurality of heat exchange plates 8 constitute a warehouse-type fixed-point dehydration mechanism located in the vacuum chamber 1, and the battery cells 10 are heated or cooled at a fixed point and for a fixed period of time in the vacuum chamber 1 through the warehouse-type fixed-point dehydration mechanism.

[0026] The feed port 11 and the discharge port 12 of the vacuum bin 1 are both provided with a transition bin 4 as a buffer between the vacuum bin 1 and the external atmospheric environment to ensure the stability of the air pressure in the vacuum bin 1. The transition bin 4 is provided with a gate valve opened or closed by translation on the vacuum bin 1 side and the external atmospheric environment side. The gate valve on the external atmospheric environment side of the feed port 11 transition bin 4 is a first gate valve 51, the gate valve on the vacuum bin 1 side of the feed port 11 transition bin 4 is a second gate valve 52, the gate valve on the vacuum bin 1 side of the discharge port 12 transition bin 4 is a third gate valve 53, and the gate valve on the external atmospheric environment side of the discharge port 12 transition bin 4 is a fourth gate valve 54.

[0027] A loading station 21 and an unloading station 22 are respectively arranged on the outside of the feed port 11 and the discharge port 12 of the vacuum bin 1. A fixture 6 return transport line 3 for the flow of the fixture 6 is arranged between the loading station 21 and the unloading station 22 on the outside of the vacuum bin 1. The fixture 6 is loaded with a pallet 7 by a three-axis manipulator 23 at the loading station 21 and unloads the pallet 7 by another three-axis manipulator 23 at the unloading station 22. The fixture 6 is moved in the vacuum bin 1 by a handling device. The loading station 21 pushes the fixture 6 into the feed port 11 transition bin 4 by a linear cylinder, and the unloading station 22 pulls the fixture 6 out of the discharge port 12 transition bin 4 by another linear cylinder.

[0028] The clamp 6 is provided with a through groove 61 with a hollow bottom for placing the tray 7, the outer wall of the tray 7 is provided with a stopper 62, and the inner wall of the through groove 61 is provided with a positioning block 71 which contacts with the positioning block 71 to lift the tray 7 when the clamp 6 and the tray 7 are transported. During the dehydration process of the battery cell 10, the clamp 6 is mounted on the material rack 13 and suspended above a heat exchange plate 8 without contacting the heat exchange plate 8, and the heat exchange plate 8 contacts the bottom of the tray 7.

[0029] When the tray 7 and the clamp 6 are placed on the heat exchange plate 8, the bottom of the tray 7 will contact the heat exchange plate 8 through the hollow groove 61 at the bottom. The clamp 6 will be separated from the tray 7 under the action of gravity and suspended under the support of the rack 13, so that the clamp 6 reduces the contact with the tray 7 and ensures that the clamp 6 is suspended and does not contact the heat exchange plate 8. When heating or cooling, the heat exchange plate 8 will only heat or cool the tray 7 and the battery cells 10 on the tray 7, and the clamp 6 will not be directly heated, thereby avoiding heat loss.

[0030] Multiple layers of dewatering bins are vertically arranged on the rack 13, and multiple heat exchange plates 8 are arranged side by side on each layer of dewatering bins. The transport device includes a vertical loading component 91, multiple horizontal transport components 96 and a vertical unloading component 92. The multiple horizontal transport components 96 are respectively arranged in the corresponding layer of dewatering bins. The vertical loading component 91 and the vertical unloading component 92 are respectively arranged on the side of the feed port 11 and the side of the discharge port 12 of the rack 13; the clamp 6 at the feed port 11 is lifted to the height of one layer of dewatering bins of the rack 13 by the vertical loading component 91 and is connected and transported to one of the heat exchange plates 8 of the dewatering bin of the layer by the horizontal transport component 96 to complete the fixed-point transport. After the dewatering is completed, the clamp 6 is transported to the vertical unloading component 92 by the horizontal transport component 96 and is connected and transported to the unloading port by the vertical unloading component 92.

[0031] A warehouse-type fixed-point water removal mechanism is used to move the fixture 6 loaded with six trays 7 to a heat exchange plate 8 (fixed point). The battery cells 10 on the heat exchange plate 8 need to reach a fixed heating or cooling time (timing length) before being moved. Direct contact heating at a fixed place effectively improves the efficiency of heat transfer, thereby reducing the heating time and reducing energy consumption. This is different from the traditional tunnel furnace in which the battery cells 10 need to be continuously transferred, so that the heat cannot be replenished in time, thereby reducing the efficiency of heat transfer and causing the disadvantage of too long heating time.

[0032] The material rack 13 is provided with five layers of dewatering bins, and eight heat exchange plates 8 are arranged side by side in each layer of dewatering bins. The materials are placed automatically through the handling device, and the warehouse-style circulation operation of automatic loading and unloading and automatic material placement is realized, which meets the first-in-first-out principle and can effectively reduce the floor space of the vacuum bin 1. The first four heat exchange plates 8 of each layer of dewatering bins are used for heating, and the last four heat exchange plates 8 are used for heating and cooling, or the heat exchange plates 8 for heating and the heat exchange plates 8 for cooling of each layer of dewatering bins are arranged alternately in sequence.

[0033] The transverse transport assembly 96 includes a moving seat 97, a support plate 99 for lifting the clamp 6, a guide rail and a rack 15 laid along the material rack 13, the support plate 99 can be raised and lowered on the moving seat 97, and the moving seat 97 is provided with a transverse moving motor 98 that drives the moving seat 97 to move along the guide rail through a transverse screw or a gear and a rack 15. The two transmission methods of the transverse screw and the gear and the rack are for the purpose of enabling the moving seat to move accurately. The accompanying drawings of this embodiment use the gear and the rack 15 for illustration; when a transverse screw is used, the transverse moving motor 98 directly drives the screw nut sleeve on the transverse screw to rotate, so as to drive the moving seat to move. Of course, the transverse moving motor 98 can be set on the material rack to drive the transverse screw to rotate, and the moving seat is connected to the screw nut sleeve, thereby driving the moving seat to move; the moving seat 97 is provided with a lifting motor 991 that drives the support plate 99 to rise and fall through a lifting screw.

[0034] The vertical loading assembly 91 and the vertical unloading assembly 92 both include a column 93, a vertical screw rod, a drive motor 95 and a top plate 94 that cooperates with the clamp 6. The two columns 93 are symmetrically arranged on the outside of the material rack 13. The drive motor 95 drives the top plate 94 to move up and down along the column 93 through the vertical screw rod arranged along the column 93.

[0035] The feeding direction of the fixture 6 from the loading station 21 to the feed port 11 of the transition chamber 4 and the vacuum chamber 1 is perpendicular to the length direction of the fixture 6 .

[0036] Multiple heat exchange plates 8 are connected in series or in parallel through pipelines to form a loop for liquid circulation, and a liquid pump 82 and a fluid control valve 81 are provided between the multiple heat exchange plates 8 and the liquid heater 83 or the liquid cooler 84. The applicant disclosed in a high vacuum tunnel furnace for dehydrating lithium batteries using a liquid bath method for heating application number CN201922392299.0 on December 27, 2019 that if the battery cell 10 is heated and cooled by a liquid bath method under a vacuum environment, the heat exchange plate 8 in the present invention is similar to the exchanger layer plate of the application to achieve the heating and cooling of the battery cell 10 by the liquid bath method. The liquid heater 83 heats the liquid, the liquid cooler 84 cools the liquid, and the liquid is circulated by the liquid pump 82 to complete the heating and cooling under high vacuum conditions. In the same vacuum environment, the water inside the battery cell evaporates and is extracted after heating, and the temperature of the battery cell is reduced by cooling to prevent rehumidification.

[0037] The heat exchange plate 8 directly heats or cools the tray 7 and the battery cell 10 in the vacuum chamber 1 by a liquid bath method, and can heat and cool the battery cell 10 under the same high vacuum conditions, which is not available in traditional tunnel furnaces. Traditional tunnel furnaces do not heat or use hot air or radiation heating, and have low thermal efficiency.

[0038] The vacuum chamber 1 and the transition chamber 4 are connected to the corresponding vacuum system control valves and the vacuum pump 14 through pipelines to achieve the switching between vacuum and pressure relief.

[0039] The working process of the present invention is as follows: The tray 7 loaded with the battery cells 10 is conveyed from the conveyor belt to the loading station 21. The three-axis robotic manipulator at the loading station 21 transports the tray 7 to the fixture 6. The second flap valve 52 is closed, and the pressure in the transition bin 4 of the feed port 11 is relieved to be equal to the external atmospheric pressure. The first flap valve 51 is opened. The fixture 6 filled with six trays 7 enters the transition bin 4 of the feed port 11 under the push of the linear cylinder. After the first flap valve 51 is closed, when the pressure in the transition bin 4 of the feed port 11 is evacuated to be basically the same as that in the vacuum chamber 1, the second flap valve 52 is opened. The fixture 6 enters the vertical loading component 91 at the feed port 11 of the vacuum chamber 1 under the push of another linear cylinder, and the second flap valve 52 is closed. The vertical loading component 91 lifts the fixture 6 and transports it to the height where one of the water removal bins is located, and then it is connected and transported by the horizontal transportation component 96 on this layer to a heat exchange plate 8 for heating on this layer. After heating is completed, it is transported to the heat exchange plate 8 for cooling on this layer. After cooling is completed, the horizontal transportation component 96 and the vertical unloading component 92 on this layer transport the fixture 6 to the discharge port 12. The transition bin 4 of the discharge port 12 is evacuated, the third flap valve 53 is opened, and the fixture 6 enters the discharge transition bin 4 under the push of the linear cylinder. The third flap valve 53 is closed, the pressure in the transition bin 4 of the discharge port 12 is relieved, the fourth flap valve 54 is opened, and the fixture 6 reaches the unloading station 22 under the push of the linear cylinder. The fourth flap valve 54 is closed, and the three-axis robotic manipulator 23 at the unloading station 22 unloads the tray 7 from the fixture 6 onto the conveyor belt to complete the unloading. The empty fixture 6 returns to the loading station 21 through the fixture 6 return transportation line 3. The fixture 6 return transportation line 3 is in a "C" shape. In order to facilitate the return of the fixture 6 and reduce the floor area, a turntable 31 that horizontally rotates the fixture 6 by 90 degrees is provided at the vertical node of the fixture 6 return transportation line 3.

[0040] The structure of the present invention is reasonable, the design is novel, and the practicability is strong. The warehousing type fixed-point water removal mechanism is adopted to heat or cool the battery cells 10 in the vacuum chamber 1 for a fixed time at a fixed point to remove the moisture in the battery cells 10; in a vacuum environment, the battery cells 10 are directly heated or cooled by the liquid bath method, reducing energy consumption. The heating or cooling of the battery cells 10 is uniform, which can effectively prevent the battery cells 10 from getting damp. The time for water removal of the battery cells 10 is short and the consistency is high. The rack 13 is provided with five layers of water removal bins, and eight heat exchange plates 8 are arranged side by side in each layer of water removal bin. The automatic placement of materials is realized through the handling device, and the warehousing type flow operation of automatic loading and unloading and automatic material placement is realized, reducing the floor area.

[0041] The above does not impose any limitation on the technical scope of the present invention. Any modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method, comprising a vacuum chamber, wherein the vacuum chamber provides a negative pressure vacuum environment to extract water vapor formed by heating the water inside the battery cells, and the battery cells are loaded in a tray for circulation, characterized in that: The vacuum bin is provided with a material rack for placing a fixture loaded with a tray, and the material rack is provided with a plurality of heat exchange plates, and the heat exchange plates are connected to a liquid heater or a liquid cooler through a pipeline and remove water from the battery cells placed on the upper part by heating or cooling; the vacuum bin is provided with a transport device for transporting the battery cells between a feed port of the vacuum bin, the heat exchange plates on the material rack, and a discharge port of the vacuum bin, and the transport device, the material rack, and the plurality of heat exchange plates constitute a warehouse-type fixed-point water removal mechanism located in the vacuum bin, and the battery cells are heated or cooled at a fixed point and for a fixed period of time in the vacuum bin through the warehouse-type fixed-point water removal mechanism; The rack is vertically provided with multiple layers of dewatering bins, and each layer of dewatering bins is provided with multiple heat exchange plates side by side. The transport device comprises a vertical loading assembly, multiple horizontal transport assemblies and a vertical unloading assembly. The multiple horizontal transport assemblies are respectively arranged in the corresponding layer of dewatering bins, and the vertical loading assembly and the vertical unloading assembly are respectively arranged on the feeding port side and the discharging port side of the rack; the clamp at the feeding port is lifted to the height of one layer of dewatering bins of the rack by the vertical loading assembly and is connected and transported to one of the heat exchange plates of the dewatering bin of the layer by the horizontal transport assembly of the layer to complete the fixed-point transport; after the dewatering is completed, the clamp is transported to the vertical unloading assembly by the horizontal transport assembly and is connected and transported to the unloading port by the vertical unloading assembly; The fixture is provided with a through slot with a hollow bottom for placing a tray, the outer wall of the tray is provided with a stopper, and the inner wall of the through slot is provided with a positioning block that contacts with the positioning block to lift the tray when the fixture and the tray are transported. During the process of removing water from the battery cell, the fixture is mounted on the material rack and suspended above a heat exchange plate without contacting the heat exchange plate, and the heat exchange plate contacts the bottom of the tray; The transverse transport assembly includes a moving seat, a support plate for lifting the clamp, a guide rail and a rack laid along the material rack. The support plate is arranged on the moving seat in a liftable manner. The moving seat is provided with a transverse moving motor that drives the moving seat to move along the guide rail through a transverse screw rod; the moving seat is provided with a lifting motor that drives the support plate to be lifted and lowered through a lifting screw rod.

2. The vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method according to claim 1, characterized in that: The vertical loading assembly and the vertical unloading assembly both include a column, a vertical screw rod, a driving motor and a top plate cooperating with the clamp. The two columns are symmetrically arranged on the outside of the material rack. The driving motor drives the top plate to move up and down along the column through the vertical screw rod arranged along the column.

3. The vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method according to claim 1, characterized in that: The feed port and the discharge port of the vacuum bin are both provided with a transition bin as a buffer between the vacuum bin and the external atmospheric environment to ensure stable air pressure in the vacuum bin. The transition bin is respectively provided with a plug valve opened or closed by translation on the vacuum bin side and the external atmospheric environment side.

4. The vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method according to claim 3, characterized in that: A loading station and an unloading station are respectively arranged outside the feed port and the discharge port of the vacuum bin; a fixture return transport line for the flow of fixtures is arranged between the loading station and the unloading station outside the vacuum bin; the fixture is loaded with a pallet by a robot at the loading station and unloaded by another robot at the unloading station; the fixture is moved in the vacuum bin by a handling device; the loading station pushes the fixture into the feed port transition bin by a linear cylinder, and the unloading station pulls the fixture out of the discharge port transition bin by another linear cylinder.

5. The vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method according to claim 4, characterized in that: The feeding direction of the clamp from the loading station to the feed port transition bin and the vacuum bin is perpendicular or parallel to the length direction of the clamp.

6. The vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method according to claim 5, characterized in that: The vacuum chamber and transition chamber are connected with corresponding vacuum system control valves and vacuum pumps through pipelines.

7. The vacuum tunnel furnace for removing water from battery cells by heating or cooling based on a liquid bath method according to claim 1, characterized in that: The multiple heat exchange plates are connected in series or in parallel through pipelines, and a liquid pump and a fluid control valve are arranged between the multiple heat exchange plates and the liquid heater or the liquid refrigerator.

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