Heating unit and oven

Abstract

The present invention discloses a heating unit and an oven, the heating unit comprises a shell and a pressure relief chamber, the top of the shell is provided with an air inlet, the bottom of the shell is open, the pressure relief chamber is arranged at the opening at the bottom of the shell, the two ends of the pressure relief chamber are respectively connected to the two inner walls of the shell, two air outlets are respectively formed between the two sides of the pressure relief chamber and the two inner walls of the shell, and also comprises an electromagnetic induction heating element, the bottom of the pressure relief chamber is open, the electromagnetic induction heating element is arranged at the opening at the bottom of the pressure relief chamber, the electromagnetic induction heating element comprises a bracket and an electromagnetic induction coil arranged in the bracket, and the two ends of the bracket are respectively connected to the top inner wall of the pressure relief chamber. The present invention saves drying time, greatly improves the efficiency of drying the electrode piece, and reduces the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to a heating unit and an oven. Background Art

[0002] In the coating process of lithium battery pole pieces, an oven is usually used to dry the pole pieces. The hull inside the box of the oven is usually provided with a nozzle, and the pole pieces are dried by the nozzle blowing out hot air. The existing nozzle generally includes a shell and a pressure relief chamber. The top of the shell is provided with an air inlet, which is connected to the wind cavity of the hull. The bottom of the shell is open, and the pressure relief chamber is arranged at the opening at the bottom of the shell. Two air outlets are formed between the two sides of the pressure relief chamber and the inner walls of the shell on both sides. When the pole pieces are actually dried, the hot air entering the wind cavity of the hull enters the shell through the air inlet, and then blows to the pole pieces through the two air outlets to dry the pole pieces, thereby achieving drying of the pole pieces. The use of hot air has low heat transfer efficiency, long drying time, low drying efficiency, and high production cost. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a heating unit and an oven, which saves drying time, greatly improves the efficiency of drying electrodes, and reduces production costs.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The first aspect of the present invention provides a heating unit, including a shell and a pressure relief chamber, wherein an air inlet is provided at the top of the shell, and the bottom end of the shell is open, and the pressure relief chamber is arranged at the opening at the bottom end of the shell, and the two ends of the pressure relief chamber are respectively connected to the two end inner walls of the shell, and two air outlets are respectively formed between the two sides of the pressure relief chamber and the two side inner walls of the shell, and also includes an electromagnetic induction heating element, the bottom end of the pressure relief chamber is open, and the electromagnetic induction heating element is arranged at the opening at the bottom end of the pressure relief chamber, and the electromagnetic induction heating element includes a bracket and an electromagnetic induction coil arranged in the bracket, and the two ends of the bracket are respectively connected to the top inner wall of the pressure relief chamber.

[0006] As a preferred technical solution, the electromagnetic induction coil is an inverted trapezoidal structure, and the shape of the bracket is compatible with the shape of the electromagnetic induction coil.

[0007] As a preferred technical solution, the bracket includes a bracket body and a cover plate, the bottom end of the bracket body is open, the cover plate is arranged at the opening at the bottom end of the bracket body, the electromagnetic induction coil is arranged in the bracket body, the two ends of the bracket body and the cover plate are respectively connected to the top inner wall of the pressure relief chamber, and the bracket body does not contact the inner walls at both ends and the inner walls on both sides of the pressure relief chamber.

[0008] As a preferred technical solution, a return air hole is provided at the bottom end of the cover plate, and an air outlet hole is provided at the top end of the bracket body. The return air hole, the interior of the bracket body, the air outlet hole and the interior of the pressure relief chamber are connected in sequence. The two ends of the pressure relief chamber are open, and the pressure relief holes at both ends of the shell are respectively connected to the interior of the pressure relief chamber through the openings at both ends of the pressure relief chamber.

[0009] As a preferred technical solution, the angle between the two oblique sides of the inverted trapezoidal structure and the horizontal line is 20-80 degrees.

[0010] As a preferred technical solution, there are multiple electromagnetic induction coils, and the multiple electromagnetic induction coils are arranged in sequence from bottom to top, and the multiple electromagnetic induction coils are connected in series.

[0011] As a preferred technical solution, it also includes two electromagnetic shielding plates located below the pressure relief chamber and the bracket, the two electromagnetic shielding plates respectively corresponding to the two ends of the electromagnetic induction coil, the two electromagnetic shielding plate portions respectively protrude from the two ends of the shell and the top ends of the two electromagnetic shielding plates respectively contact the bottom end of the pressure relief chamber and the bottom end of the bracket, the two electromagnetic shielding plates are respectively provided with mounting grooves extending along the length direction of the shell at the ends away from each other, the two ends of the shell are respectively provided with a mounting piece, each mounting piece corresponds to an electromagnetic shielding plate, the mounting piece is provided with mounting holes corresponding to the mounting grooves, and fasteners are installed in the mounting holes and the corresponding mounting grooves.

[0012] As a preferred technical solution, a mesh plate is provided in the shell, and the mesh plate is located between the top of the pressure relief chamber and the air inlet.

[0013] A second aspect of the present invention provides an oven, comprising the heating unit described in the above technical solution.

[0014] The beneficial effects of the present invention are as follows: the present invention can realize drying of the pole piece by combining hot air heating and electromagnetic induction heating through the electromagnetic induction heating element, and the electromagnetic induction heating method has the characteristics of fast response, high heating efficiency, flexible output power adjustment, etc., which improves the thermal power per unit area, saves drying time, greatly improves the efficiency of drying the pole piece, reduces production costs, reduces energy consumption, and can reduce the volume of the oven. In addition, the hot air blown out from the two air outlets can also flatten the wrinkles caused by electromagnetic induction heating and avoid oxidation of the pole ears, thereby ensuring the quality of the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 is a structural schematic diagram of a heating unit provided by an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A schematic top view of the heating unit shown;

[0018] Figure 3 yes Figure 2 AA cross-sectional schematic diagram of the heating unit shown;

[0019] Figure 4 yes Figure 2 A schematic cross-sectional view BB of the heating unit shown;

[0020] Figure 5 yes Figure 1 An exploded schematic diagram of the heating unit shown;

[0021] Figure 6 yes Figure 1 The schematic diagram of the structure of the heating unit shown is shown after removing two electromagnetic shielding plates and two mounting parts;

[0022] Figure 7 yes Figure 1 A schematic structural diagram of the electromagnetic induction heating element of the heating unit shown. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0024] Please refer to Figures 1 to 7 A heating unit provided by an embodiment of the present invention includes a shell 10, a pressure relief chamber 20, an electromagnetic induction heating element 30 and two electromagnetic shielding plates 40.

[0025] The top of the shell 10 is provided with a buckle fixing plate 12, a latch 13 and an air inlet 15, one end of the shell 10 is provided with a circular handle 14, and the bottom end of the shell 10 is open. The latch 13 is used to match with the latch hole of the hull in the box of the oven, and the buckle fixing plate 12 is used to match with the buckle position of the hull. The shell 10 can be fixed to the hull by the latch 13 and the buckle fixing plate 12. The circular handle 14 is convenient for the staff to carry the heating unit of the present invention. The air inlet 15 is located between the buckle fixing plate 12 and the latch 13. The air inlet 15 is used for air intake. In actual application, the air inlet 15 is connected to the wind cavity of the hull. In the present invention, the top of the shell 10 refers to the end of the shell 10 facing away from the pole piece, and the bottom of the shell 10 refers to the end facing the pole piece.

[0026] Both ends and the bottom of the pressure relief chamber 20 are open, and the pressure relief chamber 20 is arranged at the opening at the bottom of the housing 10. The two ends of the pressure relief chamber 20 are preferably welded to the inner walls at both ends of the housing 10, and the two pressure relief holes 18 at both ends of the housing 10 are respectively connected to the inside of the pressure relief chamber 20 through the openings at both ends of the pressure relief chamber 20. Two air outlets 16 are respectively formed between the two sides of the pressure relief chamber 20 and the inner walls at both sides of the housing 10, and the two air outlets 16 are in an inner eight-shaped shape. The air outlet 16 is used to discharge air.

[0027] The electromagnetic induction heating element 30 is arranged at the opening of the bottom end of the pressure relief chamber 20. The electromagnetic induction heating element 30 includes a bracket and an electromagnetic induction coil 33 arranged in the bracket. The electromagnetic induction coil 33 can generate an induced magnetic field after being energized.

[0028] Through the above structure, in actual application, the pole piece is located below the shell 10, and the hot air can enter the interior of the shell 10 through the air inlet 15, and then blow to the pole piece through the two air outlets 16 to dry the pole piece, thereby achieving drying of the pole piece. At the same time, the electromagnetic induction coil 33 can generate an induced magnetic field, which can generate eddy currents inside the pole piece, thereby heating the pole piece, thereby achieving drying of the pole piece. The present invention can achieve drying of the pole piece by combining hot air heating and electromagnetic induction heating through the electromagnetic induction heating element 30. The electromagnetic induction heating method has the characteristics of fast response, high heating efficiency, and flexible output power adjustment, which improves the thermal power per unit area, saves drying time, greatly improves the efficiency of drying the pole piece, reduces production costs, reduces energy consumption, and reduces the volume of the oven. In addition, the hot air blown out from the two air outlets 16 can also flatten the wrinkles caused by electromagnetic induction heating and avoid oxidation of the pole ears, thereby ensuring the quality of the pole piece.

[0029] Furthermore, a mesh plate 17 is provided in the housing 10, and the mesh plate 17 is located between the pressure relief chamber 20 and the air inlet 15. The mesh plate 17 plays a role of uniform wind through the holes thereon, so that the pressure of the airflow flowing out of the two air outlets 16 can be uniform, so that the electrode can be uniformly heated, further ensuring the drying efficiency. The mesh plate 17 has a U-shaped structure, and the two sides of the mesh plate 17 are set on the inner walls of the two sides of the housing 10 by fasteners such as screws.

[0030] In this embodiment, the electromagnetic induction coil 33 is an inverted trapezoidal structure, and the angle between the two oblique sides of the inverted trapezoidal structure and the horizontal line is 20-80 degrees, preferably 60 degrees. This structure of the electromagnetic induction coil 33 can weaken the magnetic induction intensity at its edge, ensuring that the electromagnetic induction coil 33 radiates only in the downward direction, further improving the drying efficiency. The shape of the bracket is compatible with the shape of the electromagnetic induction coil 33, and the two ends of the bracket are respectively connected to the top inner wall of the pressure relief chamber 20, and the bracket does not contact the inner walls at both ends and the inner walls on both sides of the pressure relief chamber 20.

[0031] Two electromagnetic shielding plates 40 are located below the pressure relief chamber 20 and the bracket. The two electromagnetic shielding plates 40 correspond to the two ends of the electromagnetic induction coil 33 respectively. The two electromagnetic shielding plates 40 are partially protruding from the two ends of the shell 10 respectively, and the tops of the two electromagnetic shielding plates 40 are in contact with the bottom end of the pressure relief chamber 20 and the bottom end of the bracket respectively. The ends of the two electromagnetic shielding plates 40 that are far away are respectively provided with mounting grooves 42 extending along the length direction of the shell 10. The two ends of the shell 10 are respectively provided with a mounting member 19. Each mounting member 19 corresponds to an electromagnetic shielding plate 40. The mounting member 19 is provided with mounting holes corresponding to the mounting grooves 42. The mounting holes are threaded holes. Fasteners 192 such as screws are installed in the mounting holes and the corresponding mounting grooves 42. The two electromagnetic shielding plates 40 can further weaken the magnetic induction intensity at the edge of the electromagnetic induction coil 33. The length of the mounting groove 42 is half the length of the electromagnetic shielding plate 40. By adjusting the position of the fastener 192 in the mounting groove 42, the contact area between the top of the electromagnetic shielding plate 40 and the bottom of the pressure relief chamber 20 and the bottom of the bracket can be adjusted, thereby adjusting the magnetic induction intensity at the edge of the electromagnetic induction coil 33.

[0032] In this embodiment, there are two mounting slots 42 and two mounting holes, and it is understandable that the number of mounting slots 42 and mounting holes can be set according to actual conditions. The mounting member 19 is preferably set at the corresponding end of the housing 10 by welding.

[0033] In this embodiment, there is one electromagnetic induction coil 33 , which is a planar spiral coil.

[0034] In other embodiments, there are multiple electromagnetic induction coils 33, for example, two electromagnetic induction coils 33, which are spaced apart from each other from bottom to top and connected in series. It can be understood that the number of electromagnetic induction coils 33 can be other.

[0035] In this embodiment, the bracket includes a bracket body 322 and a cover plate 323. The bottom end of the bracket body 322 is open, and the cover plate 323 is arranged at the opening of the bottom end of the bracket body 322. The electromagnetic induction coil 33 is arranged in the bracket body 322. The arranged cover plate 323 can protect the electromagnetic induction coil 33 and prevent foreign objects from scratching and contaminating the electromagnetic induction coil 33. The first screw hole 3222 and the second screw hole 3232 are respectively arranged at the two ends of the bracket body 322 and the cover plate 323. The top inner wall of the pressure relief chamber 20 is provided with a third screw hole corresponding to the first screw hole 3222 and the second screw hole 3232. Screws are installed in the first screw hole 3222, the second screw hole 3232 and the third screw hole, so that the two ends of the bracket body 322 and the cover plate 323 are respectively connected to the top inner wall of the pressure relief chamber 20, and the bracket body 322 does not contact the inner walls at both ends and the inner walls at both sides of the pressure relief chamber 20.

[0036] A return air hole 3233 is provided at the bottom end of the cover plate 323, and an air outlet hole 3223 is provided at the top end of the bracket body 322. The return air hole 3233, the interior of the bracket body 322, the air outlet hole 3223 and the interior of the pressure relief chamber 20 are connected in sequence, and the pressure relief holes 18 at both ends of the shell 10 are connected to the interior of the pressure relief chamber 20 through the openings at both ends of the pressure relief chamber 20 respectively. Since the two air outlets 16 are in an inner eight-shaped shape, the hot air will blow toward the pole piece in an inner eight-shaped shape, which will accumulate a certain amount of hot air below the pressure relief chamber 20. Part of the accumulated hot air can enter the interior of the bracket body 322 through the return air hole 3233, and then enter the interior of the pressure relief chamber 20 through the air outlet hole 3223. Part of the accumulated hot air can enter the interior of the pressure relief chamber 20 through the bracket body 322 and the inner walls at both ends of the pressure relief chamber 20 and the space between the inner walls on both sides. The hot air entering the pressure relief chamber 20 can be discharged to the outside through the openings at both ends of the pressure relief chamber 20 and the two pressure relief holes 18. In this way, pressure relief can be achieved, and the air pressure balance below the pressure relief chamber 20 can be ensured without causing deformation of the pole piece. At the same time, the hot air entering the bracket body 322 can also cool the electromagnetic induction coil 33.

[0037] In this embodiment, the return air hole 3233 is a strip hole, there is one strip hole, the strip hole is located in the middle of the bottom end of the cover plate 323 and extends along the length direction of the housing 10, and the outlet air hole 3223 is a rectangular hole, there are four rectangular holes, and the four rectangular holes are arranged at intervals. It can be understood that the shape and number of the return air hole 3233 and the outlet air hole 3223 can be set according to actual conditions.

[0038] The present invention also provides an oven, comprising a box body and the above-mentioned heating unit, wherein a hull is arranged in the box body, and the heating unit is arranged on the hull. By adopting the above-mentioned heating unit, the drying time is saved, the efficiency of drying the electrode is greatly improved, the production cost is reduced, the energy consumption is reduced, and the volume of the oven can be reduced, and the space occupied by the oven can be reduced.

[0039] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A heating unit, comprising a shell and a pressure relief chamber, wherein the top of the shell is provided with an air inlet, the bottom of the shell is open, the pressure relief chamber is arranged at the opening of the bottom of the shell, the two ends of the pressure relief chamber are respectively connected to the two end inner walls of the shell, and two air outlets are respectively formed between the two sides of the pressure relief chamber and the two side inner walls of the shell, characterized in that: It also includes an electromagnetic induction heating element, the bottom end of the pressure relief chamber is open, the electromagnetic induction heating element is arranged at the opening of the bottom end of the pressure relief chamber, the electromagnetic induction heating element includes a bracket and an electromagnetic induction coil arranged in the bracket, and the two ends of the bracket are respectively connected to the top inner wall of the pressure relief chamber; the electromagnetic induction coil is an inverted trapezoidal structure, and the shape of the bracket is adapted to the shape of the electromagnetic induction coil; the bracket includes a bracket body and a cover plate, the bottom end of the bracket body is open, the cover plate is arranged at the opening of the bottom end of the bracket body, the electromagnetic induction coil is arranged in the bracket body, the two ends of the bracket body and the cover plate are respectively connected to the top inner wall of the pressure relief chamber, and the bracket body does not contact the inner walls at both ends and the inner walls on both sides of the pressure relief chamber; the bottom end of the cover plate is provided with a return air hole, the top end of the bracket body is provided with an outlet hole, and the return The wind hole, the interior of the bracket body, the wind outlet hole and the interior of the pressure relief chamber are connected in sequence, the two ends of the pressure relief chamber are open, and the pressure relief holes at both ends of the shell are connected to the interior of the pressure relief chamber through the openings at both ends of the pressure relief chamber respectively; it also includes two electromagnetic shielding plates located below the pressure relief chamber and the bracket, the two electromagnetic shielding plates correspond to the two ends of the electromagnetic induction coil respectively, the two electromagnetic shielding plate portions protrude from the two ends of the shell respectively and the top ends of the two electromagnetic shielding plates contact the bottom end of the pressure relief chamber and the bottom end of the bracket respectively, the ends away from the two electromagnetic shielding plates are respectively provided with mounting grooves extending along the length direction of the shell, the two ends of the shell are respectively provided with a mounting piece, each mounting piece corresponds to an electromagnetic shielding plate, the mounting piece is provided with mounting hole positions corresponding to the mounting grooves, and fasteners are installed in the mounting holes and the corresponding mounting grooves.

2. The heating unit according to claim 1, characterized in that: The angle between the two oblique sides of the inverted trapezoidal structure and the horizontal line is 20-80 degrees.

3. The heating unit according to claim 1, characterized in that: There are multiple electromagnetic induction coils, which are arranged in sequence from bottom to top at intervals, and are connected in series.

4. The heating unit according to claim 1, characterized in that: A mesh plate is arranged in the shell, and the mesh plate is located between the top of the pressure relief chamber and the air inlet.

5. An oven, characterized in that: The heating device comprises a heating unit as claimed in any one of claims 1 to 4.

Images