Pole piece drying device and lithium battery production system

Abstract

The utility model relates to the technical field of pole piece drying, in particular to a pole piece drying device and a lithium battery production system. The pole piece drying device comprises a drying oven, a circulating air unit, a laser unit and a heat pump unit. The circulating air unit is used for blowing the heated circulating air into the drying oven; the laser unit comprises a laser generator and a laser drying assembly; the laser drying assembly is arranged in the drying oven and used for projecting laser generated by the laser generator to the pole pieces in the drying oven. The laser unit and the circulating air unit are matched to dry the pole piece, the drying efficiency is higher, and the phenomenon that condensate water is generated on the surface of the laser drying assembly when the laser drying assembly is independently adopted can be avoided. The heat pump unit comprises a compression part, a first throttling part, a first heat exchange part and a second heat exchange part; the compression part and the first heat exchange part are used for heating circulating air; the laser generator exchanges heat with the second heat exchange piece, waste heat at the laser generator is recycled, cold energy at the second heat exchange piece is recycled, and the energy-saving effect is obvious.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pole piece drying, especially to a pole piece drying device and a lithium battery production system. BACKGROUND

[0002] The production of lithium batteries includes a coating process and a drying process. The coating process uniformly coats active materials on the surface of a substrate to produce a pole piece; the drying process dries the pole piece obtained in the coating process to remove solvents and solidify the coating. The existing drying process usually adopts a hot air drying method, which has a fixed drying rate, resulting in the need to adjust the length of the oven according to the thickness of the active material on the surface of the substrate, which makes some ovens too long and increases equipment costs and energy consumption. In view of this, the utility model provides a pole piece drying device, which has high drying efficiency, can improve drying speed and reduce energy consumption, thereby solving the problem of excessive length of the oven and high energy consumption in the prior art. The utility model also provides a lithium battery production system, which includes the above-mentioned pole piece drying device. SUMMARY

[0003] The main purpose of the utility model is to provide a pole piece drying device that solves the problem of excessive length of the oven and high energy consumption in the prior art. The utility model also provides a lithium battery production system, which includes the above-mentioned pole piece drying device.

[0004] To achieve the above-mentioned purpose, the utility model provides a pole piece drying device in one aspect of the embodiment, which includes an oven, a circulating air unit, a laser unit and a heat pump unit.

[0005] The circulating air unit is used to blow heated circulating air into the oven.

[0006] The laser unit includes a laser generator and a laser drying assembly; the laser drying assembly is arranged in the oven and is used to project laser generated by the laser generator towards the pole piece in the oven.

[0007] The heat pump unit includes a compression member, a first throttling member, a first heat exchange member and a second heat exchange member; the circulating air unit is also used to pass circulating air into the first heat exchange member; the refrigerant is heated by the compression member and then exchanges heat with the circulating air in the first heat exchange member; the laser generator is also connected to the second heat exchange member, and the refrigerant is cooled by the first throttling member and then exchanges heat with the laser generator in the second heat exchange member.

[0008] Further, the laser generator is provided in multiple, the second heat exchange member and the laser generator are one-to-one corresponding, and all the second heat exchange members are connected in parallel.

[0009] Further, the back of the laser generator is attached to the second heat exchange member.

[0010] Further, the heat pump unit further comprises a branch, a fan and a third heat exchange element;

[0011] The branch is connected in parallel with the second heat exchange element; the third heat exchange element is arranged on the branch and arranged side by side with the second heat exchange element; the air outlet side of the fan faces the third heat exchange element and the second heat exchange element, the air flow discharged from the air outlet side of the fan flows through the third heat exchange element and the second heat exchange element in sequence, and the air flow exchanges heat with the cooled refrigerant when passing through the third heat exchange element.

[0012] Further, the heat pump unit further comprises a second throttling element;

[0013] The branch is connected in parallel with the second heat exchange element and the first throttling element; the second throttling element is arranged on the branch and used for cooling the refrigerant flowing into the branch.

[0014] Further, the circulating air unit comprises a plurality of upper air nozzle assemblies and a plurality of lower air nozzle assemblies;

[0015] The upper air nozzle assemblies and the lower air nozzle assemblies are arranged in the oven;

[0016] The upper air nozzle assemblies are located above the pole piece, and all the upper air nozzle assemblies are arranged at intervals along the pole piece conveying direction; the lower air nozzle assemblies are located below the pole piece, and all the lower air nozzle assemblies are arranged at intervals along the pole piece conveying direction.

[0017] Further, the laser drying assembly is arranged between adjacent two upper air nozzle assemblies, and / or the laser drying assembly is arranged between adjacent two lower air nozzle assemblies.

[0018] Further, the circulating air unit further comprises an air path, a fan and a filter;

[0019] Two ends of the air path are connected to the oven respectively, along the flow direction of the circulating air in the air path, the fan and the filter are arranged on the air path in sequence, and the first heat exchange element is located between the fan and the filter.

[0020] Further, the pole piece drying device comprises a plurality of ovens, and each oven is provided with the circulating air unit and the laser unit.

[0021] The utility model discloses another aspect embodiment still proposes a lithium battery production system, including the pole piece drying device of above.

[0022] The utility model discloses beneficial effect:

[0023] The utility model provides a kind of pole piece drying device, comprising: oven, circulating air unit, laser unit and heat pump unit;Circulating air unit is used to blow the circulating air after heating to oven;Laser unit includes laser generator and laser drying assembly;Laser drying assembly is set in oven, for the laser generated by laser generator is projected to the pole piece in oven;Heat pump unit includes refrigerant compression piece, first throttling piece, first heat exchange piece and second heat exchange piece;Circulating air unit is also used to pass into first heat exchange piece with circulating air;Refrigerant is heated after compression piece in first heat exchange piece and circulating air heat exchange;Laser generator is also connected with second heat exchange piece, and refrigerant is cooled after first throttling piece in second heat exchange piece and laser generator heat exchange.

[0024] Laser unit and circulating air unit cooperate to dry pole piece, and the drying efficiency is higher, and, can also avoid the condensate on the surface of laser drying assembly when laser drying assembly is used alone, one can achieve multiple purposes at a time;In heat pump unit, the waste heat at laser generator is recycled by using laser generator and second heat exchange piece heat exchange, and the cold energy at second heat exchange piece is recycled, and the energy-saving effect is obvious, and without setting mold temperature machine and the like structure and second heat exchange piece cooperate heat exchange, so that pole piece drying device occupies smaller site, saves energy consumption, and the refrigerant in second heat exchange piece is cooled more fully. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0026] Figure 1 The structure schematic view of pole piece drying device provided by the utility model embodiment is shown in the figure;

[0027] Figure 2 The structure schematic view of heat pump unit in the figure is shown in the figure; Figure 1

[0028] Figure 3 The structure schematic view of laser generator and second heat exchanger cooperation is shown in the figure;

[0029] Figure 4 The structure schematic view of low-temperature circuit and medium-temperature circuit cooperation in another embodiment of the utility model is shown in the figure;

[0030] Figure 5 The structure schematic view of pole piece drying device setting multiple ovens in another embodiment of the utility model is shown in the figure.

[0031] Figure: 1-oven;11-pole piece conveying line; ​

[0032] 21 - compression element; 22 - first throttling element; 23 - first heat exchanging element; 24 - second heat exchanging element; 25 - second throttling element; 26 - third heat exchanging element; 27 - fan; 281 - circulation circuit; 282 - branch; 291 - low temperature circuit; 292 - medium temperature circuit; 293 - evaporative condenser; 294 - first circuit; 295 - second circuit; 296 - third circuit; 297 - plate heat exchanger;

[0033] 31 - air path; 32 - upper tuyere assembly; 33 - lower tuyere assembly; 34 - upper air chamber; 35 - lower air chamber; 36 - air fan; 37 - filter;

[0034] 41 - laser generator; 42 - laser drying assembly;

[0035] 5 - pole piece. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0038] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0040] Furthermore, the terms "horizontal," "vertical," "suspended," and the like, do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. As "horizontal" merely means that it is more horizontal than "vertical," and does not mean that the structure must be perfectly horizontal, but can be slightly inclined.

[0041] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "provided", "mounted", "connected", "linked" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be connected internally between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following examples and features in the examples can be combined with each other.

[0043] As Figures 1 to 5As shown, the utility model embodiment provides a kind of pole piece drying device, comprising: oven 1, circulating air unit, laser unit and heat pump unit. Oven 1 is provided with pole piece conveying line 11 by several conveying rollers, circulating air unit is used to blow the circulating air after heating to oven 1, so that the circulating air after heating can be evenly filled in oven 1 inside, and, also be used to export the circulating air in oven 1 inside to heat pump unit, so that the circulating air after export is heated to return to oven 1 inside again;Laser unit includes laser generator 41 and laser drying assembly 42, laser generator 41 is used to generate laser, laser drying assembly 42 is set in oven 1, the laser generated by laser generator 41 can be projected to pole piece 5 in oven 1 by laser drying assembly 42, and the heat of laser is heat-transferred with solvent, to evaporate solvent;As preferred, laser generator 41 is set in oven 1, and laser generator 41 is connected between laser drying assembly 42 by optical fiber;Heat pump unit includes circulation loop 281, compression piece 21, first throttling piece 22, first heat exchange piece 23 and second heat exchange piece 24;The circulation loop 281 is closed loop structure, and compression piece 21, first throttling piece 22, first heat exchange piece 23 and second heat exchange piece 24 are all set on circulation loop 281, and circulation loop 281 is filled with refrigerant;When using, the phase of refrigerant is changed into high-temperature high-pressure gas phase after being treated by compression piece 21, the high-temperature high-pressure gas phase refrigerant enters first heat exchange piece 23, and is heat-exchanged with the circulating air conveyed by circulating air unit in first heat exchange piece 23, and the temperature of circulating air is increased, while the phase of high-temperature high-pressure gas phase refrigerant is changed into high-temperature high-pressure liquid phase, then, the high-temperature high-pressure liquid phase refrigerant is conveyed to first throttling piece 22, and is changed into low-temperature low-pressure liquid phase after throttling by first throttling piece 22, and the low-temperature low-pressure liquid phase refrigerant enters second heat exchange piece 24, laser generator 41 is connected with second heat exchange piece 24, and the low-temperature low-pressure liquid phase refrigerant is heat-exchanged with laser generator 41 in second heat exchange piece 24, to reduce the temperature of laser generator 41, while the phase of low-temperature low-pressure liquid phase refrigerant is changed into low-temperature low-pressure gas phase, and the low-temperature low-pressure gas phase refrigerant returns to compression piece 21, to form complete refrigeration cycle.

[0044] The pole piece drying device provided by the utility model embodiment cooperates with the laser unit and the circulating air unit to dry the pole piece 5, so that the drying efficiency is higher, and condensate water can be avoided on the surface of the laser drying assembly 42 when the laser drying assembly 42 is used alone, which is multi-purpose in one go.

[0045] In the optional technical scheme of the embodiment,Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, multiple laser generators 41 are provided to improve the drying efficiency of the laser unit. Furthermore, each second heat exchanger 24 corresponds one-to-one with a laser generator 41, and the laser generator 41 is connected to its corresponding second heat exchanger 24 to improve the cooling effect on the laser generator 41. All second heat exchangers 24 are connected in parallel on the circulation loop 281, thus ensuring that the flow rate and temperature of the refrigerant flowing into each second heat exchanger 24 are the same. This improves both the cooling effect on the laser generator 41 and the heat exchange effect on the refrigerant.

[0046] In the optional technical solutions of this embodiment, such as Figure 3 As shown, the back of the laser generator 41 is directly attached to the second heat exchanger 24, and heat is transferred by heat conduction, which reduces heat loss and has higher heat exchange efficiency.

[0047] In the optional technical solutions of this embodiment, such as Figure 1 , Figure 2 and Figure 5 As shown, the heat pump unit also includes a branch 282, a fan 27, and a third heat exchanger 26. The two ends of the branch 282 are respectively connected to the circulation loop 281, and the branch 282 is connected in parallel with the second heat exchanger 24. In use, the high-temperature and high-pressure liquid refrigerant discharged from the first heat exchanger 23 is diverted to the branch 282, and the refrigerant entering the branch 282 is the low-temperature and low-pressure liquid refrigerant after throttling. The third heat exchanger 26 is disposed in the branch 282, and the third heat exchanger 26 is disposed side by side with the second heat exchanger 24. The fan 27 is disposed next to the third heat exchanger 26, and the air outlet side of the fan 27 is disposed towards the third heat exchanger 26 and the second heat exchanger 24. In this way, when the electrode drying device is running, the fan 27 can blow the outside air towards the third heat exchanger 26 and the second heat exchanger 24. The airflow discharged from the air outlet side of the fan 27 first contacts the third heat exchanger 26. The low-temperature and low-pressure liquid refrigerant in the third heat exchanger 26 exchanges heat with the airflow discharged from the air outlet side of the fan 27. The phase of the low-temperature and low-pressure liquid refrigerant changes to the low-temperature and low-pressure gas phase. After the airflow exchanges heat with the low-temperature and low-pressure liquid refrigerant in the third heat exchanger 26, the temperature of the airflow decreases. The cooled airflow then contacts each of the second heat exchangers 24 and the laser generator 41, thereby preventing the surface temperature of the laser generator 41 or the second heat exchanger 24 from falling below the ambient dew point and forming condensation, which would cause the laser generator 41 to short-circuit.

[0048] As a preferred option, such as Figure 1 , Figure 2 and Figure 5As shown, the heat pump unit further comprises a second throttling device 25 arranged on a branch 282 which is in parallel with the second heat exchange device 24 and the first throttling device 22. In use, part of the high-temperature and high-pressure liquid-phase refrigerant discharged from the first heat exchange device 23 is branched into the branch 282, and the rest enters the first throttling device 22. The high-temperature and high-pressure liquid-phase refrigerant on the branch 282 is throttled by the second throttling device 25 and changes into low-temperature and low-pressure liquid phase and enters the third heat exchange device 26. In this way, the amount of refrigerant entering the third heat exchange device 26 can be independently adjusted, which is convenient for control.

[0049] In other embodiments, the second heat exchange device 24 and the third heat exchange device 26 can share the same throttling device, which can also achieve the purpose of the refrigerant entering the second heat exchange device 24 and the third heat exchange device 26 being low-temperature and low-pressure liquid-phase refrigerant in this embodiment.

[0050] In the optional technical scheme of this embodiment, as shown in Figure 1 and Figure 5 As shown, the circulating air unit comprises a plurality of upper air nozzle assemblies 32 and a plurality of lower air nozzle assemblies 33. The upper air nozzle assemblies 32 and the lower air nozzle assemblies 33 are arranged in the oven 1, and the upper air nozzle assemblies 32 are located above the pole piece conveying line 11, and the lower air nozzle assemblies 33 are located below the pole piece conveying line 11. The air outlet ends of the upper air nozzle assemblies 32 and the lower air nozzle assemblies 33 are arranged towards the pole piece conveying line 11. The upper air nozzle assemblies 32 and the lower air nozzle assemblies 33 cooperate to make the circulating air uniformly fill the oven 1, thereby improving the drying efficiency. The upper air nozzle assemblies 32 and the lower air nozzle assemblies 33 are arranged at intervals along the conveying direction of the pole piece conveying line 11.

[0051] Further, in this embodiment, the circulating air unit further comprises an upper air chamber 34 and a lower air chamber 35. The upper air chamber 34 and the lower air chamber 35 are arranged in the oven 1, and the air outlets of the air pipes are in communication with the upper air chamber 34 and the lower air chamber 35, respectively. Each upper air nozzle assembly 32 is in communication with the upper air chamber 34, and each lower air nozzle assembly 33 is in communication with the lower air chamber 35.

[0052] Optionally, in this embodiment, the upper air nozzle assemblies 32 and the lower air nozzle assemblies 33 can adopt floating air nozzles or mesh air nozzles.

[0053] In the optional technical scheme of this embodiment, the laser drying assembly 42 can be arranged between any two adjacent upper air nozzle assemblies 32, between any two adjacent lower air nozzle assemblies 33, or between any two upper air nozzle assemblies 32 and any two adjacent lower air nozzle assemblies 33. The specific arrangement can be determined according to the actual situation. The laser drying assembly 42 comprises a plurality of laser heads which are uniformly arranged in the packaging structure.

[0054] In the optional technical scheme of this embodiment, as shown inFigure 1 and Figure 5 As shown, the circulating air unit also includes an air duct 31, a fan 36, and a filter 37. The air inlet of the air duct 31 is connected to the oven 1, and the air outlets are connected to the upper air chamber 34 and the lower air chamber 35, respectively. The fan 36 is mounted on the air duct 31 and is used to provide power for the circulating air. After exchanging heat with the first heat exchanger 23, the circulating air is filtered by the filter 37 and enters the upper air chamber 34 and the lower air chamber 35, and is blown into the oven 1 by the upper air nozzle assembly 32 and the lower air nozzle assembly 33. The filter 37 can filter out impurities in the circulating air, ensuring that the circulating air entering the oven 1 is clean and preventing dust from forming on the surface of the electrode 5, which would affect the yield.

[0055] Optionally, in other embodiments, the heat pump unit may also employ a cascade heat pump system, such as... Figure 1 As shown, it is divided into a low-temperature module and a medium-temperature module. The low-temperature module includes a low-temperature circuit 291, and a first throttling element 22, a second throttling element 25, a second heat exchange element 24 and a third heat exchange element 26 are disposed on the low-temperature circuit 291. The medium-temperature module includes a medium-temperature circuit 292, and a first heat exchange element 23 and a compressor 21 are disposed on the medium-temperature circuit 292. In use, the low-temperature module and the medium-temperature module exchange heat through the evaporator-condenser 293 to ensure that the low-temperature module can operate at a lower temperature, thereby obtaining enough heat for circulating air heating.

[0056] In this embodiment, the optional technical solution may include multiple drying ovens 1 to accommodate different conveying speeds of the electrode conveying line 11. Each drying oven 1 is equipped with a circulating air unit and a laser unit. For the heat pump unit, each drying oven 1 may have its own heat pump unit, or they may be integrated. Specifically, the heat pump unit integrates a cold and hot water system; such as... Figure 5 As shown, each oven 1 has a branch 282, a first throttling element 22, a second throttling element 25, a second heat exchanger 24, and a third heat exchanger 26 as a first module; the heat pump unit also includes a first loop 294, a second loop 295, and a third loop 296. Each first module is connected in parallel to the first loop 294. The first loop 294 is equipped with a cold water tank. The first loop 294 and the second loop 295 exchange heat through a plate heat exchanger 297. The second loop 295 is equipped with a compressor 21. The second loop 295 and the third loop 296 exchange heat through a plate heat exchanger 297. The third loop 296 is equipped with a surface cooler corresponding to the circulating air unit as a first heat exchanger 23. The third loop 296 is also equipped with a hot water tank. The third loop 296 contains circulating water and water-containing organic solvents.

[0057] In the optional operating conditions of the electrode drying apparatus provided in this embodiment, such as... Figure 4 Figure 5 Figure 1As shown, the first heat exchange member 23 is a condenser, the second heat exchange member 24 is a cooling plate with a porous sealing structure inside, the third heat exchange member 26 is an evaporator, the first throttling member 22 is a first expansion valve, the second throttling member 25 is a second expansion valve, and the compression member 21 is a compressor. The condenser, the cooling plate, the first expansion valve and the compressor are connected to a circulating loop 281, the second expansion valve and the evaporator are connected to a branch 282, and the branch 282 is connected in parallel to the circulating loop 281. When the pole piece drying device is running, first, the fan 36 is turned on to enable the circulating air to circulate; the fan 27 is turned on and the flow path to the cooling plate is closed; the compressor is started to heat the circulating air; the laser generator 41 is turned on, and the flow path to the cooling plate is turned on after the laser generator 41 runs for a preset time, so that the refrigerant can cool the laser generator 41; after the laser generator 41 is running, the pole piece conveying line 11 starts to convey the pole piece 5. Through the two drying modes of hot air and laser, the drying efficiency is high and the cost is low.

[0058] In other embodiments, the compression member 21 can also be an adsorption heat pump, and the first throttling member 22 and the second throttling member 25 can also be capillary tubes.

[0059] The utility model discloses another embodiment still provides a kind of lithium battery production system, including the pole piece drying device in any embodiment described above.

[0060] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not limited to them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An electrode drying apparatus, characterized in that, The application relates to a laser drying device for drying polar pieces. The laser drying device comprises an oven (1), a circulating air unit, a laser unit and a heat pump unit. The circulating air unit is used for blowing heated circulating air into the oven (1). The laser unit comprises a laser generator (41) and a laser drying assembly (42); the laser drying assembly (42) is arranged in the oven (1) and is used for projecting laser generated by the laser generator (41) to the polar pieces (5) in the oven (1). The heat pump unit comprises a compression component (21), a first throttling component (22), a first heat exchange component (23) and a second heat exchange component (24); the circulating air unit is also used for passing the circulating air into the first heat exchange component (23); the refrigerant is heated by the compression component (21) and then exchanges heat with the circulating air in the first heat exchange component (23); the laser generator (41) is also connected with the second heat exchange component (24); the refrigerant is cooled by the first throttling component (22) and then exchanges heat with the laser generator (41) in the second heat exchange component (24).

2. The pole piece drying apparatus of claim 1, wherein A plurality of laser generators (41) are arranged; the second heat exchange components (24) are arranged in one-to-one correspondence with the laser generators (41); and all the second heat exchange components (24) are arranged in parallel.

3. The pole piece drying apparatus of claim 1, wherein The back of the laser generator (41) is attached to the second heat exchange component (24).

4. The pole piece drying apparatus according to any one of claims 1 to 3, characterized in that, The heat pump unit further comprises a branch (282), a fan (27) and a third heat exchange component (26). The branch (282) is connected in parallel with the second heat exchange component (24); the third heat exchange component (26) is arranged on the branch (282) and is arranged in parallel with the second heat exchange component (24); the air outlet side of the fan (27) faces the third heat exchange component (26) and the second heat exchange component (24); the air flow discharged from the air outlet side of the fan (27) sequentially flows through the third heat exchange component (26) and the second heat exchange component (24); and the air flow exchanges heat with the cooled refrigerant when passing through the third heat exchange component (26).

5. The pole piece drying apparatus of claim 4, wherein The heat pump unit further comprises a second throttling component (25). The branch (282) is connected in parallel with the second heat exchange component (24) and the first throttling component (22); the second throttling component (25) is arranged on the branch (282) and is used for cooling the refrigerant flowing into the branch (282).

6. The pole piece drying apparatus of claim 1, wherein The circulating air unit comprises a plurality of upper air nozzle assemblies (32) and a plurality of lower air nozzle assemblies (33). The upper air nozzle assemblies (32) and the lower air nozzle assemblies (33) are arranged in the oven (1). The upper air nozzle assemblies (32) are located above the polar pieces (5); all the upper air nozzle assemblies (32) are arranged in intervals along the conveying direction of the polar pieces (5); the lower air nozzle assemblies (33) are located below the polar pieces (5); and all the lower air nozzle assemblies (33) are arranged in intervals along the conveying direction of the polar pieces (5).

7. The pole piece drying apparatus of claim 6, wherein The laser drying assemblies (42) are arranged between adjacent two upper air nozzle assemblies (32) and / or between adjacent two lower air nozzle assemblies (33).

8. The pole piece drying apparatus of claim 1, wherein The circulating air unit further comprises an air path (31), a fan (36) and a filter (37). Two ends of the air path (31) are connected to the oven (1) respectively, and along the flow direction of the circulating air in the air path (31), the fan (36) and the filter (37) are sequentially arranged on the air path (31), and the first heat exchange member (23) is located between the fan (36) and the filter (37).

9. The pole piece drying apparatus of claim 1, wherein, The pole piece drying device comprises a plurality of ovens (1), and each oven (1) is provided with the circulating air unit and the laser unit.

10. A lithium battery production system characterized by comprising: The pole piece drying device comprises a plurality of ovens (1), and each oven (1) is provided with the circulating air unit and the laser unit.

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