Steam rolling system for battery pole piece

Abstract

The utility model relates to a steam rolling system for a battery pole piece. The steam rolling system comprises a steam generation unit, a spraying unit and a drying unit, a steam outlet of the steam generating unit is in fluid communication with a steam inlet of the spraying unit; wherein the steam generating unit is used for generating hot steam; the spraying unit is used for applying hot steam to the pole piece; and the drying unit is used for drying the pole piece to which the hot steam is applied so as to remove water on the surface of the pole piece. The steam rolling system disclosed by the utility model is simple and easy to operate, and the problem of warping of the battery pole piece can be effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the field of new energy equipment, and in particular, to a steam rolling system for battery electrodes. Background Art

[0002] Compared with lead-acid batteries, nickel-metal hydride batteries, etc., lithium-ion batteries are widely used in the fields of 3C, power, energy storage, etc. due to their high energy density, long cycle life, low self-discharge rate, no memory effect, etc. With the continuous iteration of batteries, the market's demand for fast-charging and high-energy-density batteries is becoming increasingly urgent, accelerating the rapid development of the entire industrial chain. In order to improve the charge and discharge rate and energy density of batteries, scientific researchers and engineers have started from the cell structure and raw materials, and adopted the lamination process in the manufacturing process to improve the fast-charging ability of the battery, and continuously reduce the thickness of the current collector to improve the energy density of the battery. As the current collector becomes thinner and thinner, during the lamination and winding processes, the single-sided electrode is prone to warping after rolling, resulting in the inability of the laminator and winder to automatically grasp the electrode, affecting the battery production efficiency and yield.

[0003] Before the positive and negative electrodes are laminated, they usually need to go through processes such as mixing, coating, pressing, and slitting. During the rolling process of the electrode, since the copper foil side of the negative single-sided electrode is coated with a dressing and the other side is not, after the electrode is rolled, the binder molecules on the coated side are compressed, causing the dressing to extend, while the uncoated side is a bare copper foil, so it does not extend after rolling. Due to the different extensions on both sides, the electrode warps towards the bare copper foil side, which affects the laminator's grasping of the electrode, thus affecting the lamination efficiency and yield.

[0004] Regarding the warping problem, some studies have proposed a method of spraying a solvent on the coated surface of the single-sided electrode after the rolling process, and re-plasticizing the adhesive by allowing the solvent to stay on the electrode surface for 10 - 60 minutes to improve the warping of the electrode. However, this method still has major problems. On the one hand, it is impossible to evenly disperse the solvent on the electrode by spraying, resulting in the inability of the adhesive molecules on the coated surface to be evenly unfolded, and the poor uniformity of the electrode. On the other hand, the solvents used in this method are organic solvents such as dimethylacetamide, N,N-dimethylformamide, and triethyl phosphate, which are difficult to volatilize and remain on the electrode. After making the electrode into a battery cell, it will affect the battery performance. Thirdly, this method requires sequential processes of spraying, standing, and drying, with cumbersome operations and a long time.

[0005] In the prior art, there is also research on mechanisms for improving the warping of electrode sheets. It mainly uses the relative movement of a support mechanism and a slicing mechanism, and by setting tooth-like protrusions on the lower support block, it can form embossments on the current collector on the outer side with active material on one side, thereby solving the problem of poor dead folds of electrode sheets in the prior art. However, the drawback is that after the extrusion relative movement, the tooth pattern of the lower support block will cause concave patterns on the surface of the electrode sheet, resulting in an uneven surface of the electrode sheet, and causing different local lithium deintercalation distances on the surface of the electrode sheet during the battery cycling process, thus affecting the battery cycling performance.

[0006] Therefore, it is necessary to develop a battery electrode sheet steam rolling system that is simple and easy to operate, has a good warping improvement effect, and has no impact on battery performance. Utility Model Content

[0007] The purpose of the present disclosure is to provide a battery electrode sheet steam rolling system, which is simple and easy to operate and can effectively improve the warping problem of battery electrode sheets.

[0008] To achieve the above purpose, the present disclosure provides a battery electrode sheet steam rolling system, which includes a steam generation unit, a spraying unit, and a drying unit; the steam outlet of the steam generation unit is in fluid communication with the steam inlet of the spraying unit;

[0009] Among them, the steam generation unit is used to generate hot steam;

[0010] The spraying unit is used to apply hot steam to the electrode sheet;

[0011] The drying unit is used to dry the electrode sheet after applying hot steam to remove the water on the surface of the electrode sheet.

[0012] Optionally, the steam rolling system further includes a hot air generating device;

[0013] The spraying unit has a housing and a spraying area inside the housing. The top surface of the housing is provided with an electrode sheet inlet and an electrode sheet outlet for the electrode sheet to pass through. The spraying area is only in communication with the outside through the electrode sheet inlet and the electrode sheet outlet; a porous partition is arranged in the spraying area, and the porous partition divides the spraying area into an upper hot steam distribution section and a lower hot air distribution section. The hot air distribution section is formed as the drying unit;

[0014] The hot air outlet of the hot air generating device is in fluid communication with the hot air inlet of the hot air distribution section.

[0015] Optionally, steam nozzles are arranged on the side wall of the spraying area close to the electrode sheet inlet. The steam nozzles form the steam inlets of the spraying unit, and the openings of the steam nozzles face the main surface of the electrode sheet facing the side wall.

[0016] Optionally, the system further includes a traction mechanism, and the traction mechanism includes a first roller group and a second roller group;

[0017] The first roller group is arranged outside the top surface of the housing of the spraying unit, and the second roller group is arranged inside the hot steam distribution section of the spraying unit. The second roller group is close to and parallel to the porous partition plate. The straight line where the axis of the first roller group is located is parallel to the length direction of the pole piece inlet and / or the pole piece outlet, and the straight line where the axis of the second roller group is located is parallel to the length direction of the pole piece inlet and / or the pole piece outlet.

[0018] Optionally, the steam rolling system further includes a return water tank and a three-way valve; the first opening of the three-way valve is in fluid communication with the steam outlet of the steam generating unit, the second opening of the three-way valve is in fluid communication with the steam inlet of the spraying unit, and the third opening of the three-way valve is in fluid communication with the inlet of the return water tank.

[0019] Optionally, the steam rolling system further includes a water storage device, and the water outlet of the water storage device is in fluid communication with the water inlet of the steam generating unit.

[0020] Optionally, the steam rolling system further includes an electric control cabinet and an encoder. The encoder is signal-connected to the electric control cabinet, and the encoder is used to control the time for delivering hot steam into the spraying area.

[0021] Optionally, the steam rolling system further includes a detection mechanism, and the detection mechanism is used to detect and determine the junction between the single-sided coating area and the double-sided coating area of the pole piece to control whether to deliver steam into the spraying area.

[0022] Optionally, the hot air generating device is selected from a hot air blower or a warm air blower.

[0023] Optionally, the steam generating unit includes a steam generator or a steam iron.

[0024] Through the above technical solutions, the battery pole piece steam rolling system of the present disclosure has a spraying unit and a drying unit. In this unit, the hot steam is dried after contacting the pole piece to be processed, so that the adhesive molecules inside the pole piece are reactivated. At the same time, the high temperature of the hot steam is conducive to the breaking of the molecular bonds in the adhesive molecules. Under the dual action of the above, the problem of pole piece warping can be significantly improved in a very short time, and in the system of the present disclosure, improving the pole piece warping has no adverse effect on the electrochemical performance of the battery.

[0025] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0027] Figure 1 It is a schematic structural diagram of a specific implementation of the battery pole piece steam rolling system of the present disclosure.

[0028] Figure 2 It is a schematic structural diagram of a specific implementation manner of the spray unit in the battery electrode sheet steam rolling system of the present disclosure.

[0029] Description of the reference numerals

[0030] 1. Base 2. Three-way valve 3. Spray unit

[0031] 4. Encoder fixing device 5. Traction device 6. Electric control cabinet

[0032] 7. Water storage device 8. Steam generation unit 9. Return water tank

[0033] 10. First pipeline 11. Encoder Specific implementation manner

[0034] The following will describe in detail the specific implementation manner of the present disclosure with reference to the accompanying drawings. It should be understood that the specific implementation manner described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0035] The present disclosure provides a battery electrode sheet steam rolling system, which includes a steam generation unit 8, a spray unit 3, and a drying unit; the steam outlet of the steam generation unit 8 is in fluid communication with the steam inlet of the spray unit; wherein, the steam generation unit 8 is used to generate hot steam; the spray unit is used to apply hot steam to the electrode sheet; the drying unit is used to dry the electrode sheet after applying hot steam to remove the water on the surface of the electrode sheet.

[0036] The battery electrode sheet steam rolling system of the present disclosure has a spray unit and a drying unit. In this system, the hot steam contacts the electrode sheet to be processed and enters the dressing layer of the electrode sheet, so that the adhesive molecules in the electrode sheet dressing layer are reactivated; at the same time, the high-temperature hot steam is conducive to the breaking and rearrangement of the molecular bonds in the adhesive molecules, thereby effectively releasing the internal stress of the electrode sheet. Under the dual action of the above, the warping height of the electrode sheet drops instantaneously within 0-2 seconds, and the problem of electrode sheet warping can be significantly improved in a very short time, and the operation is simple and convenient. And in the system of the present disclosure, the residual moisture after the steam contacts the electrode sheet to be processed is immediately dried, which has no adverse effect on the electrochemical performance of the battery while effectively improving the problem of electrode sheet warping.

[0037] According to the present disclosure, the drying unit has the effect of drying the residual moisture on the surface of the electrode sheet. The drying unit can include devices with a drying function well-known to those skilled in the art, such as a high-temperature oven, a constant-temperature oven, a trolley oven, etc. In this embodiment, the electrode sheet after being spray-treated by the spray unit is placed in the drying device of the drying unit to remove the water on the residual surface of the electrode sheet.

[0038] In the present disclosure, the spraying unit and the drying unit can be two independent units, or two units with a coupling relationship in terms of structure. To achieve the intensification of the system structure, as Figure 2 shown, in a specific embodiment of the present disclosure, the steam rolling system further includes a hot air generating device; the spraying unit has a housing and a spraying area inside the housing, and the top surface of the housing is provided with a pole piece inlet and a pole piece outlet for the pole piece to pass through, and the spraying area is only communicated with the outside through the pole piece inlet and the pole piece outlet; a porous partition is arranged in the spraying area, and the porous partition divides the spraying area into an upper hot steam distribution section and a lower hot air distribution section, and the hot air distribution section is formed as the drying unit; the hot air outlet of the hot air generating device is in fluid communication with the hot air inlet of the hot air distribution section. In this embodiment, by arranging the porous partition to divide the spraying area into an upper hot steam distribution section and a lower hot air distribution section, the spraying unit and the drying unit are ingeniously integrated and coupled together. In this embodiment, by centrally arranging a hot steam distribution section and a hot air distribution section in the spraying area, and the two are in fluid communication, the hot air from the hot air distribution section enters the upper hot steam distribution section to dry the pole piece, which simplifies the system structure, reduces the operation steps, and improves the production efficiency.

[0039] In the present disclosure, in order to further improve the effect of improving the warping of the pole piece, in a preferred specific embodiment of the present disclosure, a steam nozzle is arranged on the side wall of the spraying area close to the pole piece inlet, and the steam nozzle is formed as the steam inlet of the spraying unit, and the opening of the steam nozzle faces the main surface of the pole piece facing the side wall. In this embodiment, after the pole piece to be processed enters the spraying area of the spraying unit, it immediately contacts the hot steam ejected from the steam nozzle, and the adhesive molecules inside the pole piece are reactivated under the action of the high-temperature hot steam, and the molecular chains are broken and rearranged, so that the internal stress of the pole piece is released. The pole piece after contacting the hot steam continues to be conveyed forward, and the pole piece is mainly blown by the hot air in the area close to the porous partition to remove the residual water on the pole piece, thereby effectively improving the warping problem of the pole piece.

[0040] According to the present disclosure, the steam nozzle is well known to those skilled in the art. For example, it can be a wide-width slit steam nozzle, a mesh steam nozzle, a pinhole steam nozzle or a distributed steam nozzle, and the diameter of the steam nozzle can vary within a large range. In a specific embodiment of the present disclosure, the opening width of the steam nozzle is 0.2-1.5 m.

[0041] According to the present disclosure, the system further includes a traction mechanism 5, which includes a first roller group and a second roller group; the first roller group is disposed outside the top surface of the housing of the spraying unit, and the second roller group is disposed inside the hot steam distribution section of the spraying unit. The second roller group is close to the porous partition and parallel to the porous partition, which can make the electrode sheet close to the porous partition, facilitating the hot air to blow the electrode sheet to remove residual water; the straight line where the axis of the first roller group is located is parallel to the length direction of the electrode sheet inlet and / or the electrode sheet outlet, and the straight line where the axis of the second roller group is located is parallel to the length direction of the electrode sheet inlet and / or the electrode sheet outlet.

[0042] As Figure 2 shown, in a specific embodiment of the present disclosure, the first roller group includes a first over-roller and a second over-roller, and the second roller group includes a third over-roller and a fourth over-roller; the first over-roller and the second over-roller are independently disposed outside the top surface of the housing of the spraying unit, and the straight line where the axis of the first over-roller is located is perpendicular to the conveying direction of the electrode sheet, and the straight line where the axis of the second over-roller is located is perpendicular to the conveying direction of the electrode sheet; the third over-roller and the fourth over-roller are independently disposed inside the hot steam distribution section of the spraying unit, and both ends of the third over-roller and both ends of the fourth over-roller are independently connected to the inner side wall of the spraying area. The straight line where the axis of the third over-roller is located is perpendicular to the conveying direction of the electrode sheet, and the straight line where the axis of the fourth over-roller is located is perpendicular to the conveying direction of the electrode sheet. Preferably, the third over-roller and the fourth over-roller are respectively located below the electrode sheet inlet and the electrode sheet outlet to improve the hot air drying efficiency.

[0043] In one embodiment, the rolled electrode sheet enters the spraying area from the electrode sheet inlet under the traction of the first over-roller, contacts with hot steam and hot air in the spraying area, and then leaves the spraying area from the electrode sheet outlet under the traction of the second over-roller and the third over-roller, and then leaves the battery electrode sheet steam rolling system under the traction of the fourth over-roller.

[0044] In a specific embodiment of the present disclosure, the steam rolling system further includes a return water tank 9 and a three-way valve 2; the first opening of the three-way valve is in fluid communication with the steam outlet of the steam generating unit 8, the second opening of the three-way valve is in fluid communication with the steam inlet of the spraying unit, and the third opening of the three-way valve is in fluid communication with the inlet of the return water tank 9. In this embodiment, when it is necessary to apply steam to the electrode sheet, the first opening and the second opening are opened and the third opening is closed, and the hot steam enters the spraying unit through the first opening and the second opening. When the application of hot steam is completed, the first opening and the second opening are closed and the third opening is opened, so that the excess hot steam in the pipeline enters the return water tank. In this preferred embodiment, the process of applying hot steam to the electrode sheet is flexibly regulated, effectively avoiding the influence of the excess hot steam in the system on the electrode sheet.

[0045] In a specific embodiment of the present disclosure, the first opening of the three-way valve is in fluid communication with the steam outlet of the steam generating unit 8 through the first pipeline 10, the second opening of the three-way valve is in fluid communication with the steam inlet of the spraying unit through the second opening, and the third opening of the three-way valve is in fluid communication with the inlet of the return water tank 9 through the third pipeline.

[0046] In a specific embodiment of the present disclosure, the steam rolling system further includes a water storage device 7, and the water outlet of the water storage device 7 is in fluid communication with the water inlet of the steam generating unit 8. The water storage device may be well-known to those skilled in the art, for example, it may be a water storage tank.

[0047] In a specific embodiment of the present disclosure, the steam rolling system further includes an electric control cabinet 6 and an encoder 11. The encoder is signal-connected to the electric control cabinet 6, and the encoder 11 is used to control the time for delivering hot steam into the spraying area. The encoder in the present disclosure is well-known to those skilled in the art and will not be elaborated herein. According to the present disclosure, the encoder may be disposed on the encoder fixing device 4, and the encoder fixing device may be, for example, a fixing bracket horizontally arranged along the axis.

[0048] In order to accurately detect the pole piece with single-sided dressing during the continuous rolling process of the pole piece and apply hot steam to it to improve the warping problem, in a specific embodiment of the present disclosure, the steam rolling system further includes a detection mechanism. The detection mechanism is used to detect and determine the junction between the single-sided coating area and the double-sided coating area of the pole piece to control whether to deliver steam into the spraying area. The detection mechanism is well-known to those skilled in the art. In one embodiment, the detection mechanism may be, for example, an infrared detector, a laser sensor, an optical fiber sensor, a CCD or a color mark sensor.

[0049] In the present disclosure, the hot air generating device 2 is commonly used by those skilled in the art. In a specific embodiment of the present disclosure, the hot air generating device is selected from a hot air blower or a warm air blower, and the hot air blower may be selected from an electric heating hot air blower or an oil heating hot air blower. In the present disclosure, the hot air generated by the hot air generating device enters the hot air section of the spraying area and then enters the steam distribution section through the porous partition, and the hot steam contacts the pole piece to effectively improve the warping problem of the pole piece.

[0050] In the present disclosure, the steam generating unit includes a device that can generate hot steam and is well-known to those skilled in the art. In a specific embodiment of the present disclosure, the steam generating unit includes a steam generator or a steam iron, and the steam generator may be selected from a nano steam generator, an electric heating steam generator or an oil heating steam generator.

[0051] In a specific embodiment of the present disclosure, the spray unit further includes a base 1, which is used to support the body of the spray unit to improve the structural stability of the spray unit. In the present disclosure, the connection manner between the base and the spray unit is not specifically limited. For example, it can be detachably connected to facilitate maintenance and adaptively adjust the height of the spray unit according to the usage requirements.

[0052] According to the present disclosure, the hot steam generated by the steam generating unit comes from the vaporized aqueous solution. The aqueous solution can be a solvent that is well-known to those skilled in the art and can volatilize at a relatively low temperature. For example, it can be selected from one or more of deionized water, sodium carboxymethyl cellulose solution, lithium carboxymethyl cellulose solution, styrene-butadiene rubber solution, and N-methylpyrrolidone.

[0053] The present disclosure will be further illustrated by the following examples, but the present disclosure is not limited thereby.

[0054] Example 1

[0055] (1) Fabrication of battery electrode

[0056] Put the active material, binder, conductive agent, and deionized water into a double planetary mixer, and form a uniform negative electrode slurry through high-speed dispersion. Transfer the prepared slurry to a coater and dry it in an oven at 50 - 100 °C. Transfer the dried electrode to a rolling press and roll the electrode under a pressure of 10 - 35 T and a roll gap of 0 - 150 μm.

[0057] (2) Improvement of battery electrode warping

[0058] In Figure 1 Improve the problem of electrode warping in the shown system. In the figure, the battery electrode steam rolling system includes a steam generating unit 8, a spray unit 3, a drying unit, a hot air generating device, a traction mechanism, a return water tank 9, a three-way valve, a water storage device, an electric control cabinet, an encoder, and a detection mechanism. The water outlet of the water storage device 7 is in fluid communication with the water inlet of the steam generating unit; the encoder 11 is signal-connected to the electric control cabinet 6; the detection mechanism is used to detect and determine the junction between the single-sided coating area and the double-sided coating area of the electrode to control whether to transport steam into the spray area.

[0059] The spraying unit 3 has a spraying area. On the top surface of the body of the spraying area, there are provided a pole piece inlet and a pole piece outlet for allowing the pole piece to pass through. The spraying area is communicated with the outside only through the pole piece inlet and the pole piece outlet. On the side wall of the spraying area close to the pole piece inlet, there is provided a steam nozzle, and the steam nozzle forms the steam inlet of the spraying unit. The opening of the steam nozzle faces the main surface of the opposite side wall of the pole piece. A porous partition is arranged in the spraying area, and the porous partition divides the spraying area into an upper hot steam distribution section and a lower hot air distribution section. The hot air distribution area forms a drying unit; the hot air outlet of the hot air generating device is in fluid communication with the hot air inlet of the hot air distribution area.

[0060] The traction mechanism 5 includes a first over-roller, a second over-roller, a third over-roller and a fourth over-roller; the first over-roller and the second over-roller are independently arranged outside the top surface of the spraying area. The straight line where the axis of the first over-roller is located is perpendicular to the conveying direction of the pole piece, and the straight line where the axis of the second over-roller is located is perpendicular to the conveying direction of the pole piece; the third over-roller and the fourth over-roller are independently arranged in the spraying area. The two ends of the third over-roller and the two ends of the fourth over-roller are independently connected to the inner side wall of the spraying area. The straight line where the axis of the third over-roller is located is perpendicular to the conveying direction of the pole piece, and the straight line where the axis of the fourth over-roller is located is perpendicular to the conveying direction of the pole piece.

[0061] The first opening of the three-way valve 2 is in fluid communication with the steam outlet of the steam generating unit 8, the second opening of the three-way valve 2 is in fluid communication with the steam inlet of the spraying unit 3, and the third opening of the three-way valve is in fluid communication with the inlet of the return water tank 9.

[0062] Put the prepared water-soluble solution into the water storage device 7, introduce it into the steam generating unit 8 through the water storage device 7, turn on the steam generator in the steam generating unit 8 to generate hot steam, and let the roller-pressed battery pole piece pass through the hot steam at a running speed of (5 - 50 m / min) and a temperature of (40 - 100 °C). The warping height of the pole piece decreases accordingly, and then it is swept by hot air at (30 - 120 °C) to dry the remaining moisture, obtaining the pole piece after steam treatment, and the warping problem of the pole piece is significantly improved.

[0063] As can be seen from the above, the system of the present disclosure is simple and easy to operate, and can effectively improve the problem of warping of the battery pole piece.

[0064] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0065] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0066] Furthermore, any combinations can be made among the various different embodiments of the present disclosure as long as they do not violate the idea of the present disclosure, and they should also be regarded as the content disclosed by the present disclosure.

Claims

1. A battery pole piece steam rolling system, characterized in that: The steam rolling system comprises a steam generating unit (8), a spray unit (3) and a drying unit; the steam outlet of the steam generating unit is in fluid communication with the steam inlet of the spray unit; Wherein, the steam generating unit (8) is used to generate hot steam; The spray unit is used to apply the hot steam to the pole piece; The drying unit is used to dry the electrode after hot steam is applied to remove water from the surface of the electrode.

2. The steam rolling system according to claim 1, characterized in that: The steam rolling system also includes a hot air generating device; The spray unit comprises a shell and a spray zone inside the shell, a pole piece inlet and a pole piece outlet for the pole piece to pass through are provided on the top surface of the shell, and the spray zone is connected to the outside only through the pole piece inlet and the pole piece outlet; a porous partition is provided in the spray zone, and the porous partition divides the spray zone into an upper hot steam distribution section and a lower hot air distribution section, and the hot air distribution section forms the drying unit; The hot air outlet of the hot air generating device is fluidly connected to the hot air inlet of the hot air distribution section.

3. The steam rolling system according to claim 2, characterized in that: A steam nozzle is arranged on the side wall of the spray zone close to the pole piece inlet, and the steam nozzle forms the steam inlet of the spray unit. The opening of the steam nozzle faces the pole piece toward the main surface of the side wall.

4. The steam rolling system according to claim 2, characterized in that: The system further comprises a traction mechanism (5), wherein the traction mechanism comprises a first roller group and a second roller group; The first roller group is arranged outside the top surface of the shell of the spray unit, and the second roller group is arranged in the hot steam distribution section of the spray unit. The second roller group is close to the porous partition and parallel to the porous partition. The straight line where the axis of the first roller group is located is parallel to the length direction of the pole piece inlet and / or the pole piece outlet, and the straight line where the axis of the second roller group is located is parallel to the length direction of the pole piece inlet and / or the pole piece outlet.

5. The steam rolling system according to claim 1, characterized in that: The steam rolling system further comprises a return water tank (9) and a three-way valve (2); a first opening of the three-way valve is connected to the steam outlet fluid of the steam generating unit (8), a second opening of the three-way valve is connected to the steam inlet fluid of the spray unit, and a third opening of the three-way valve is connected to the inlet fluid of the return water tank (9).

6. The steam rolling system according to claim 2, characterized in that: The steam rolling system further comprises a water storage device (7), the water outlet of the water storage device (7) being fluidically connected to the water inlet of the steam generating unit (8).

7. The steam rolling system according to claim 2, characterized in that: The steam rolling system further comprises an electric control cabinet (6) and an encoder (11), wherein the encoder (11) is connected to the electric control cabinet (6) by signals, and the encoder (11) is used to control the time for delivering hot steam to the spraying area.

8. The steam rolling system according to claim 2, characterized in that: The steam rolling system further comprises a detection mechanism, which is used to detect and determine the boundary between the single-sided coating area and the double-sided coating area of ​​the electrode piece to control whether steam is delivered to the spraying area.

9. The steam rolling system according to claim 2, characterized in that: The hot air generating device is selected from a hot air blower or a warm air blower.

10. The steam rolling system according to claim 1, characterized in that: The steam generating unit includes a steam generator or a garment steamer.

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