Spraying assembly of coating machine and transfer type pole piece coating machine with solvent spraying function

Abstract

The utility model discloses a coating machine spraying assembly and a transfer type pole piece coating machine with a solvent spraying function, the spraying assembly comprises an atomizing nozzle and a roller body, a cavity for storing spraying liquid is arranged in the roller body, and the atomizing nozzle is communicated with the cavity through a first pipeline; the coating machine further comprises a material groove, a coating roller, a scraper and a back roller, the coating roller is dipped in active substance slurry in the material groove and conveys and transfers the active substance slurry to the surface of the current collector, the atomizing nozzle is arranged towards the coating roller and sprays a solvent to a slurry transfer path, and the roller body is arranged as the back roller of the transfer type pole piece coating machine; according to the scheme, the solvent is sprayed to the periphery of the slurry transfer path through the spraying assembly, the humidity of the periphery of the slurry transfer path is improved, the volatilization speed of the solvent in the slurry is reduced, smooth coating is guaranteed, and the coating requirement of the water-based slurry is particularly met; the back roller is used for storing the solvent, so that the structure of the coating machine is simplified, and the temperature difference among the slurry, the current collector and the roller body in the coating process is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coating equipment, concretely relates to a spraying assembly of coating machine and transfer type pole piece coating machine with solvent spraying function. BACKGROUND

[0002] Coating as the key step of pole piece preparation directly influences the performance and consistency of pole piece, and at present, the environment dew point and coating temperature need to be strictly controlled in the coating process, which will lead to the coating of water-based slurry being very difficult, the rapid volatilization of deionized water directly leading to the decrease of pole piece quality and consistency, and even the coating being unable to be carried out due to the solvent volatilizing too fast.

[0003] Therefore, the spraying assembly for supplementing the solvent into the slurry tank is usually arranged in the existing coating machine, although the spraying assembly can control the concentration of slurry in the slurry tank, but the coating process has certain requirements on the concentration of slurry, the supplement of the solvent into the slurry tank can only ensure that the slurry will not dry and block due to the volatilization of the solvent, and cannot avoid the problems caused by the volatilization of the solvent in the slurry transfer process; and when the coating is measured and sampled in the coating process, the coating needs to be paused, at this time, the thickness of the water-based slurry attached to the surface of the coating roller is thinner, the volatilization speed of the solvent is faster, and the slurry cannot be transferred to the current collector surface in time, and blocking will occur in a short time, leading to the coating being unable to be carried out normally.

[0004] In addition, the temperature difference between the roller body of the coating machine and the slurry is too large, which is one of the factors directly leading to the rapid volatilization of the solvent, if the spraying device and the roller body are heated respectively, on the one hand, the working energy consumption of the coating machine is increased, and on the other hand, the structure of the coating machine is complicated, which is not conducive to operation and maintenance.

[0005] Therefore, the utility model is provided. UTILITY MODEL CONTENT

[0006] The utility model solves one of the problems in the prior art, provides a pole piece coating machine spraying assembly, a cavity is arranged in the roller body, the spraying liquid is stored in the cavity, and the spraying function is provided for the coating machine through the nozzle; the spraying liquid with a specific temperature is stored in the cavity, the temperature control of the roller body and the spraying is realized, the roller body and the spraying device need not be heated separately, and the equipment structure is simplified.

[0007] The utility model also provides a transfer type pole piece coating machine with solvent spraying function, the environmental humidity around the slurry transfer path is improved through the spraying assembly in the slurry transfer process, the volatilization speed of the solvent is effectively reduced, and the blocking of the slurry is avoided; the temperature of the solvent stored in the cavity in the roller body can be adjusted according to the requirement, on the one hand, the stability of the slurry temperature is ensured through the spraying of the solvent, and on the other hand, the temperature control of the roller body is also realized.

[0008] In order to achieve the above object, the utility model provides a pole piece coating machine spray subassembly, including atomizing nozzle and roll body, the roll body inside has the cavity containing spray liquid, the cavity is connected with outside through the discharge port of roll body end part, the atomizing nozzle is detachably connected with the discharge port through the first pipeline,

[0009] The first pipeline is provided with the pump body for extracting the spray liquid in the cavity.

[0010] In the above scheme, the technician stores the spray liquid in the cavity in advance, when spraying is needed, the spray liquid is delivered to the atomizing nozzle through the first pipeline and sprayed through the atomizing nozzle, and the pressure at the atomizing nozzle is controlled through the pump body, which realizes the smooth spraying, even under the condition of strictly controlling dew point and coating temperature, the water-based slurry can be coated smoothly, and the pump body can also control the on-off state of the first pipeline, by controlling the temperature of the pre-stored spray liquid, the control of the roll body temperature and the spray temperature can be realized at the same time, without separately setting the roll body heating device and the spray liquid heating device, the coating machine structure is greatly simplified.

[0011] Further, the two ends of the roll body have coaxially arranged roll shafts, at least one of which is provided as a hollow cylindrical structure, the cavity is communicated with the outside through the hollow cylindrical structure, and the discharge port is formed at the end of the roll shaft.

[0012] In the above scheme, the discharge port is arranged at the end of the roll shaft, so that the first pipeline can always be connected with the cavity and does not affect the normal rotation of the coating roll, without repeated disassembly, the use experience is improved.

[0013] And the spray liquid can be extracted from the roll shafts at both ends according to the spraying needs to realize flexible control of the spraying amount.

[0014] Further, one end of the roll body forms a discharge port, and the opposite end is provided with a liquid supplementing port for communicating the cavity with the outside, and a one-way valve is arranged at the liquid supplementing port to open the cavity.

[0015] In the above scheme, the technician does not need to dismount the roll body to fill the spray liquid before coating, but can directly add through the liquid supplementing port, which simplifies the filling operation of the spray liquid, the one-way valve is arranged at the liquid supplementing port to avoid leakage and backflow of the spray liquid, improve the sealing performance of the cavity, and the heat of the spray liquid can only be released through the surface of the roll body or the spray, improve the heating effect of the roll body and the heat preservation effect of the spray liquid.

[0016] Further, the roll shaft at the other end of the roll body is provided as a hollow cylindrical structure, and the liquid supplementing port is formed at the end of the roll shaft.

[0017] The spray subassembly further comprises a spray liquid storage unit, and the liquid supplementing port is connected with the spray liquid storage unit through a second pipeline.

[0018] In the above scheme, as the spraying proceeds, the spraying liquid stored in the roller body is continuously reduced, and there is a problem that the spraying liquid is insufficient to continuously spray, and the reduction of the spraying liquid causes a significant change in the temperature of the roller body, which is not conducive to the stable progress of coating. By providing a spraying liquid storage unit and connecting it with the cavity through the second pipeline, the spraying liquid is replenished in time. In addition, the spraying liquid storage unit can store the spraying liquid with a certain temperature after being preheated, and in order to ensure the stability of the temperature of the spraying liquid, the spraying liquid storage unit can be provided with a heat preservation structure.

[0019] Further, the cavity is further provided with a third pipeline communicating the liquid supplementing port with the discharge port, and the third pipeline is coiled in the cavity.

[0020] In the above scheme, the spraying liquid is separated from the inner wall of the cavity by the third pipeline, which avoids the pollution of the spraying liquid by impurities and stains in the cavity, and the coiled arrangement of the third pipeline increases the amount of spraying liquid contained in the cavity, which is conducive to maintaining the stability of the temperature of the roller body.

[0021] Further, the pole piece coating machine spraying assembly further comprises,

[0022] a temperature detection unit for detecting the temperature of the surface of the roller body;

[0023] a temperature adjusting unit for adjusting the temperature of the spraying liquid entering the cavity;

[0024] The temperature detection unit and the temperature adjusting unit are respectively in communication connection with the control unit.

[0025] In the above scheme, the temperature adjusting unit can be arranged in the cavity inside the roller body, or arranged on the second pipeline or in the spraying liquid storage unit. After receiving the temperature feedback from the temperature detection unit, if it is judged that the temperature is too high or too low, the temperature of the spraying liquid can be adjusted by the temperature adjusting unit to ensure the stability of the temperature of the roller body.

[0026] Further, the temperature adjusting unit is arranged in the spraying liquid storage unit, and the spraying assembly further comprises a fourth pipeline, a three-way valve with one inlet and two outlets is arranged at the discharge port, the first pipeline and the fourth pipeline are respectively connected with two outlets of the three-way valve, and the other end of the fourth pipeline is connected with the spraying liquid storage unit.

[0027] In the above scheme, the spraying liquid circulation path is formed by the second pipeline, the cavity and the fourth pipeline, and the repeated heating of the spraying liquid in the cavity is realized by the circulation flow of the spraying liquid, which further improves the temperature stability of the roller body and the stability of the spraying temperature. Compared with the continuously rotating roller body in the coating process, the spraying liquid storage unit remains stationary, which is convenient for the installation, maintenance and use of the temperature adjusting unit.

[0028] The utility model discloses a second aspect provides a kind of transfer type pole piece coating machine with solvent spraying function, including tank, and dip active material slurry in tank and it is transferred to the coating roller of current collector surface, the slurry transfer path of active material in tank is formed to current collector surface on the surface of coating roller, further include the spraying assembly in the above-mentioned scheme, the atomizing nozzle of spraying assembly is towards slurry transfer path setting, for spraying solvent to slurry transfer path in slurry transfer process.

[0029] In the above scheme, the atomizing nozzle is arranged towards the slurry transfer path, and the humidity around the slurry transfer path is adjusted by spraying during the coating process, thereby reducing the evaporation speed of the solvent in the slurry. In particular, the problem of the slurry adhering to the surface of the coating roller being too thin and being more likely to dry and solidify due to solvent evaporation is solved, ensuring the smooth progress of the coating.

[0030] Further, the scraper for adjusting the thickness of the slurry on the surface of the coating roller and the backing roller forming a slurry transfer gap with the coating roller are further included.

[0031] The atomizing nozzle sprays solvent to at least one of the two regions.

[0032] Further, the backing roller has a cavity inside, serving as the roller body in the spraying assembly.

[0033] In the above scheme, the backing roller is used as the roller body in the spraying assembly, which reduces the temperature difference when the current collector contacts the slurry by heating the backing roller, improving the quality of the pole piece. And the backing roller is chosen instead of the coating roller because the warming effect of the spraying liquid on the coating roller may actually promote the evaporation of the solvent.

[0034] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.

[0035] 1. The roller body has a cavity, and the technician stores the spraying liquid in the roller body. The roller body is affected by the temperature of the spraying liquid, and the temperature of the roller body is adjusted by adjusting the temperature of the spraying liquid. The spraying liquid stored in the cavity is delivered to the atomizing nozzle for spraying when spraying is needed. The spraying assembly integrates the functions of roller heating and spraying, simplifying the structure of the coating machine. Even in the case of strict control of dew point and coating temperature, the water-based slurry can be coated smoothly.

[0036] 2. The first pipeline and the fourth pipeline are connected to the discharge port of the cavity through a three-way valve, forming a circulating path for the spraying liquid. The temperature of the roller body and the spraying liquid is adjusted by the temperature adjusting unit in the spraying liquid storage unit, ensuring the temperature stability of the roller body and the spraying liquid.

[0037] 3、The slurry on the slurry transfer path is thinner, and the solvent volatilization degree changes more obviously with the change of the transfer time, so the spraying of the solvent around the slurry transfer path through the atomizing nozzle increases the air humidity around the slurry transfer path, reduces the volatilization speed of the solvent in the slurry, and effectively avoids the solidification of the slurry.

[0038] 4、The spraying assembly takes the back roller as a roller body with a cavity, the temperature of the back roller is adjusted through the spraying liquid, the temperature difference between the slurry and the current collector is reduced, the drying of the slurry on the surface of the current collector is promoted to a certain extent through the heating of the back roller on the current collector, and the quality of the pole piece is improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a structural schematic view of the spraying assembly in example one;

[0040] Figure 2 is a structural schematic view of the spraying assembly in example two;

[0041] Figure 3 is a structural schematic view of a third pipeline in the spraying assembly in example three;

[0042] Figure 4 is a structural schematic view of the spraying assembly in example four;

[0043] Figure 5 is a structural schematic view of the coating area of the transfer type coating machine with the solvent spraying function in example five;

[0044] Figure 6 is a connection schematic view of the temperature adjusting unit, the temperature detecting unit and the control unit in the spraying assembly.

[0045] In the figure: 1, atomizing nozzle; 2, roller body; 201, roller shaft; 202, discharge port; 203, liquid supplementing port; 3, first pipeline; 4, second pipeline; 5, third pipeline; 6, fourth pipeline; 7, rotary joint; 8, spraying liquid storage unit; 9, three-way valve; 10, doctor blade; 11, coating roller; 12, trough. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and the following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0047] In the description of the utility model, it needs to explain, the term "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore cannot be understood as the limitation to the utility model.

[0048] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium. For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0049] The utility model provides a kind of pole piece coating machine spray subassembly, as shown in figure Figures 1 to 6 It includes atomizing nozzle 1, roller body 2 first pipeline 3 and pump body (not shown in drawing), roller body 2 inside has the cavity containing spray liquid, cavity is communicated with outside from the discharge port 202 formed in one end of roller body 2, atomizing nozzle 1 is detachably connected with discharge port 202 by first pipeline 3, and pump body is arranged on first pipeline 3;When pole piece coating machine needs to spray, pump body starts, and the spray liquid stored in cavity is pumped to atomizing nozzle 1 by first pipeline 3, and is sprayed to the position needing to spray by atomizing nozzle 1.

[0050] Meanwhile, if the temperature of roller body 2 needs to be controlled during coating process, specific temperature spray liquid can be introduced into cavity to realize the adjustment of the temperature of roller body 2, and the temperature of spray liquid sprayed by atomizing nozzle 1 is close to the temperature of roller body 2, which is conducive to the control of temperature consistency during pole piece coating process, realizes that spray liquid and roller body 2 share a temperature adjustment unit, and simplifies the structure of coating machine;Through the above scheme, even under the condition of strictly controlling dew point and coating temperature, water-based slurry can be smoothly coated.

[0051] In addition, since roller body 2 can actively or passively rotate during the working process of coating machine, in order to avoid that the spray liquid in the cavity affects the normal rotation of roller body 2, roller body 2 can be provided in two layers along the radial direction, the two-layer structure is coaxially arranged, the inner layer remains stationary, and the outer layer is rotatably arranged relative to the inner layer, and the cavity is located in the inner layer;Or other roller body 2 known in the art can be used to realize part of the structure stationary, which will not be described here.

[0052] The specific embodiments of the utility model will be described in further detail below with reference to the drawings.

[0053] Embodiment one

[0054] As an embodiment of the utility model, the embodiment provides a spraying assembly of an electrode sheet coating machine. In the embodiment, the two ends of the roller body 2 are provided with protruding roller shafts 201. The roller shafts 201 are provided in a hollow cylindrical structure, one end of which is in communication with the cavity, and the other end is in communication with the outside. The end of the roller shaft 201 forms a discharge port 202.

[0055] Specifically, as shown in the figure, Figure 1 the first pipeline 3 and the discharge port 202 are connected through a rotary joint 7, that is, the inner ring and the outer ring of the rotary joint 7 are connected with the first pipeline 3 and the roller shaft 201 respectively, so that the roller body 2 can rotate freely in the state of being connected with the first pipeline 3, without the need to repeatedly connect and separate the first pipeline 3 and the discharge port 202, avoiding the wear of the connection structure caused by separation and connection, and improving the service life of the spraying assembly.

[0056] Further, in the embodiment, the roller body 2 is detachably arranged relative to the electrode sheet coating machine. Before coating, the first pipeline 3 and the rotary joint 7 need to be separated, the roller body 2 is removed, and then the rotary joint 7 is separated from the discharge port 202. The spraying liquid is supplemented into the cavity through the discharge port 202; after the supplement is completed, the rotary joint 7 is assembled, the roller body 2 is reinstalled on the electrode sheet coating machine, and then the first pipeline 3 is connected with the rotary joint 7, realizing the supplement of the spraying liquid, and further ensuring the smooth spraying in the coating process.

[0057] It should be noted that when the temperature of the electrode sheet coating needs to be controlled, the spraying liquid at the corresponding temperature can be sent into the cavity. The spraying liquid can adjust the temperature of the roller body 2 through heat radiation and heat exchange on one hand, and can directly change the spraying temperature from the atomizing nozzle 1 on the other hand.

[0058] However, the above scheme still needs to repeatedly disassemble the first pipeline 3, the rotary joint 7 and even the roller body 2, which is not conducive to operation and increases the preparation work of the electrode sheet coating. Therefore, a liquid supplement port 203 is further arranged on the roller body 2. The liquid supplement port 203 is arranged at the other end opposite to the discharge port 202. Unlike the discharge port 202, the liquid supplement port 203 is provided with a cover (not shown in the figure). The cover can block the external impurities and dust from entering the cavity to pollute the spraying liquid, and can also avoid the leakage of the spraying liquid from the liquid supplement port 203 to a certain extent. A one-way valve (not shown in the figure) can also be arranged at the liquid supplement port 203. The one-way valve can only open inward from the outside of the cavity, which can more reliably realize the one-way closure of the liquid supplement port 203, and further avoid the leakage of the spraying liquid.

[0059] Embodiment two

[0060] As another embodiment of the present invention, this embodiment makes the following improvements based on embodiment one.

[0061] In this embodiment, to further improve the ease of use of the spray assembly, such as Figure 2 As shown, the spray assembly also includes a spray liquid storage unit 8, which is set independently of the roller body 2 and is connected to the replenishment port 203 through the second pipe 4. The second pipe 4 enables automatic replenishment of liquid into the cavity. Compared with the roller body 2, the spray liquid storage unit 8 has a higher degree of freedom in its setting. On the one hand, it can be set in a more convenient position according to the ease of adding, which is more convenient than directly replenishing the spray liquid into the cavity through the replenishment port 203. In addition, the capacity of the cavity is affected by the size of the roller body 2, while the capacity of the spray liquid storage unit 8 is relatively free. By setting a larger capacity, the frequency of active replenishment of spray liquid can be reduced, which further improves the user experience and convenience of the spray assembly.

[0062] The structure of the second pipe 4 can be adjusted according to different situations. For example, when the spray liquid storage unit 8 is set higher than the roller body 2, a corresponding on / off valve (not shown in the figure) is provided on the second pipe 4. When the spray liquid storage unit 8 is set lower than the roller body 2, a corresponding pump body is provided on the second pipe 4.

[0063] In order to replenish the liquid while the roller body 2 is rotating, the replenishment port 203 can be set at the end of the roller shaft 201 located at the other end of the roller body 2 in the same form as the discharge port 202. The second pipe 4 is also connected to the replenishment port 203 through the rotary joint 7. In the above scheme, whether the roller body 2 is stationary or rotating, a stable connection with the first pipe 3 and the second pipe 4 can be achieved. Unless inspection, maintenance and replacement are required, disassembly is not required at other times.

[0064] Example 3

[0065] As another embodiment of the present invention, this embodiment is further improved on the basis of embodiment two as follows.

[0066] In this embodiment, as Figure 3 As shown, a third pipe 5 is also provided inside the cavity. The two ends of the third pipe 5 are connected to the liquid replenishment port 203 and the discharge port 202, respectively. The spray liquid is separated from the inner wall of the cavity through the third pipe 5, which avoids the spray liquid from contacting the inner wall of the cavity and being contaminated by impurities and stains on the inner wall of the cavity. This ensures the cleanliness of the spray liquid sprayed by the atomizing nozzle 1 and also prevents the atomizing nozzle 1 from being blocked by impurities and stains and failing to work properly.

[0067] Further, in order to keep the spray liquid clean while ensuring the temperature regulation effect on the roller body 2, the third pipeline 5 is arranged in a coil shape in the cavity, so that the length of the third pipeline 5 in the cavity is longer, thereby reducing the influence of the third pipeline 5 on the capacity of the spray liquid in the cavity; as an embodiment of the utility model, the third pipeline 5 reciprocates along the length direction of the roller body 2 to form a serpentine pipeline, and the third pipeline 5 is arranged around the roller shaft 201, so that the serpentine pipeline is distributed along the curved surface around the roller shaft 201; the serpentine pipeline forms multiple distribution layers from the outside to the inside along the radial direction of the roller body 2, one end close to the outermost layer is connected with the liquid supplementing port 203, and one end close to the innermost layer is connected with the discharge port 202, so that the spray liquid entering the cavity first approaches the surface of the roller body 2 and then gradually moves away from the surface of the roller body 2 along the third pipeline 5, thereby realizing more sufficient heat exchange between the spray liquid and the roller body 2 and ensuring that the temperature of the roller body 2 is closer to the temperature of the spray liquid flowing out from the spray liquid storage unit 8.

[0068] In other embodiments, the third pipeline 5 can also be arranged in other ways, and the solutions obtained by making conventional modifications and replacements to the arrangement of the third pipeline 5 on the basis of knowing the technical principles of the utility model also fall within the protection scope of the utility model.

[0069] Embodiment Four

[0070] As another embodiment of the utility model, the embodiment further makes the following improvements on the basis of embodiment three.

[0071] In the embodiment, as shown in Figure 4 the spray assembly further comprises a fourth pipeline 6, one end of the fourth pipeline 6 is connected with the discharge port 202 and the other end is connected with the spray liquid storage unit 8, that is, a spray liquid circulation passage formed by the spray liquid storage unit 8, the second pipeline 4, the third pipeline 5 and the fourth pipeline 6 is obtained, through the spray liquid circulation passage, the circulation flow of the spray liquid is realized, and the decrease of the temperature stability of the roller body 2 caused by the failure of the spray liquid in the third pipeline 5 to be updated in time is avoided.

[0072] Specifically, the other end of the rotary joint 7 connected with the discharge port 202 is connected with a three-way valve 9, the inlet of the three-way valve 9 is connected with the rotary joint 7, the two outlets are respectively connected with the first pipeline 3 and the fourth pipeline 6, and the connection state of the discharge port 202 with the first pipeline 3 and the fourth pipeline 6 is switched through the three-way valve 9; when spraying is needed, the three-way valve 9 connects the discharge port 202 with the first pipeline 3 to realize spraying; when spraying is not needed, the three-way valve 9 connects the discharge port 202 with the fourth pipeline 6 to realize the circulation of the spray liquid.

[0073] In order to further improve the stability of the spray liquid and the roller body 2 temperature control, the spray assembly further comprises a temperature detection unit, a temperature adjusting unit and a control unit, the temperature detection unit and the temperature adjusting unit are respectively in communication connection with the control unit, after the temperature detection unit obtains the temperature of the surface of the roller body 2, the temperature detection unit sends the control unit, the control unit compares the actual temperature of the surface of the roller body 2 with the preset temperature, and when it is judged that the actual temperature of the roller body 2 is too high or too low, the temperature of the spray liquid is adjusted through the temperature adjusting unit, so that the temperature of the surface of the roller body 2 is controlled; in other embodiments, the control unit can also display the comparison result or the actual temperature of the surface of the roller body 2 to the technician through the display unit, and the technician judges whether to adjust, and sends an instruction to the control unit, and the control unit controls the temperature adjusting unit to adjust the temperature of the spray liquid according to the instruction.

[0074] The temperature adjusting unit can be selected and arranged at any position of the circulating passage according to actual conditions, in the embodiment, as shown in the figure, Figure 6 Due to the arrangement of the third pipeline 5, compared with directly arranging the temperature adjusting unit in the cavity, the roller body 2 has higher temperature uniformity; by arranging the temperature adjusting unit, the technician does not need to heat the spray liquid separately and then put it into the spray liquid storage unit 8, which further improves the use experience of the spray assembly.

[0075] In addition, the temperature adjusting unit, the temperature detection unit and the control unit in the embodiment can also be applied to the schemes described in embodiment one, embodiment two and embodiment three.

[0076] The utility model further provides a transfer type pole piece coating machine using the spray assembly in the above embodiment, and specifically as follows.

[0077] Embodiment five

[0078] As an embodiment of the utility model, the embodiment provides a transfer type pole piece coating machine with solvent spraying function, the coating machine comprises a trough 12, and a coating roller 11 which dips active substance slurry in the trough 12 and transfers the active substance slurry to the surface of the current collector, in the transfer process, the slurry is attached to the surface of the coating roller 11 and moves along with the rotation of the coating roller 11, and forms a slurry transfer path of the transferred slurry on the surface of the coating roller 11.

[0079] The embodiment adopts the spraying assembly as described in Embodiment One, and the atomizing nozzle 1 in the spraying assembly sprays the solvent to the active material slurry on the slurry transfer path. In this embodiment, the atomizing nozzle 1 is arranged opposite to the slurry transfer path along the radial direction of the coating roller 11, so that the atomized solvent can be more uniformly dispersed around the slurry transfer path, and under the condition of being opposite to the slurry transfer path, part of the sprayed solvent falls on the slurry, further reducing the evaporation speed of the solvent in the slurry; the spraying position of the atomizing nozzle 1 can be adjusted according to actual use requirements.

[0080] The fixing mode of the atomizing nozzle 1 can also be set according to actual conditions. In this embodiment, the atomizing nozzle 1 is fixed on the rack of the pole piece coating machine; in other embodiments, the first pipeline 3 can also be set as an adjustable flexible pipe that can be adjusted and maintained in a specific shape, and the atomizing nozzle 1 is fixed through the first pipeline 3.

[0081] In this embodiment, the structure of the coating area of the transfer type pole piece coating machine provided with the spraying assembly is as shown in Figure 5 The pole piece coating machine further includes a doctor blade 10 for adjusting the thickness of the slurry on the surface of the coating roller 11, and a back roller forming a slurry transfer gap with the coating roller 11. The atomizing nozzle 1 sprays to a section of the slurry transfer path between the doctor blade 10 and the back roller. The thickness of the slurry attached to the surface of the coating roller 11 is thin itself, and the evaporation speed of the solvent is faster compared with the slurry in the tank 12. Especially the slurry between the doctor blade 10 and the back roller, the thickness of which is further reduced after passing through the doctor blade 10, and the whole is located downstream of the slurry transfer path, and is more likely to dry and clog in advance due to the large evaporation of the solvent, directly affecting the smooth progress of coating. The atomizing nozzle 1 sprays the solvent to the slurry transfer path between the doctor blade 10 and the back roller, reduces the evaporation speed of the solvent by increasing the humidity around the slurry transfer path, avoids the clogging of the slurry, and ensures the smooth progress of coating.

[0082] In other embodiments, the atomizing nozzle 1 can also spray to other positions of the slurry transfer path, such as a section between the doctor blade 10 and the tank 12; or multiple atomizing nozzles 1 can be arranged along the slurry transfer path to simultaneously spray to different positions of the slurry transfer path, further improving the uniformity of spraying.

[0083] Further, in the embodiment, the roller body 2 in the spraying assembly is arranged as a back roller of the pole piece coating machine; the temperature of the back roller is adjusted by the solvent, thereby adjusting the temperature of the current collector, reducing the temperature difference between the current collector and the slurry; the temperature of the slurry can also be adjusted synchronously by the solvent sprayed from the atomizing nozzle 1 to the slurry, so that the process of transferring the slurry to the surface of the current collector is not affected by the large temperature difference between the slurry and the current collector, and the quality of the pole piece is improved; in other embodiments, the roller body 2 in the spraying assembly can also be arranged as a coating roller 11, or a roller with other functions, such as a guiding roller of the current collector, or a counter roller for rolling the pole piece.

[0084] The transfer type pole piece coating machine with the solvent spraying function provided by the utility model can not only be used for coating of conventional slurry, but also fully meet the coating demand of water-based slurry, because the environment dew point needs to be controlled in the pole piece coating process, the water-based slurry is prone to rapid drying and caking in the transfer process and cannot be smoothly coated, and the application and popularization are obviously limited, and the problem is effectively solved by adjusting the humidity around the slurry conveying path in the coating process through the spraying assembly, and the volatilization speed of the solvent in the slurry is reduced.

[0085] It should be noted that the transfer type coating machine with the solvent spraying function can be used for coating of different system slurries such as oil-based and water-based slurries, and the roller body 2 in the spraying assembly is preferably arranged as a back roller when coating the water-based slurry, and if arranged as a coating roller 11, the temperature of the coating roller 11 is synchronously increased when the temperature of the spraying liquid needs to be increased, which may further promote the volatilization of the solvent in the slurry on the surface of the coating roller 11, thereby affecting the smooth coating.

[0086] The embodiment can also be combined with embodiment two, embodiment three and embodiment four to obtain other embodiments, and the other embodiments obtained after the combination also fall within the protection scope of the utility model.

[0087] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model has been disclosed as above with the preferred embodiment, however, it is not used to limit the utility model, any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution range of the utility model, and equivalent embodiments of equivalent changes are obtained, and the implementation schemes in the above-mentioned embodiments can be further combined or replaced, as long as the content does not depart from the technical solution of the utility model, any simple modification, equivalent change and modification of the above-mentioned embodiments according to the technical essence of the utility model still belong to the range of the utility model.

Claims

1. A pole piece coater spray assembly characterized by, The spray assembly comprises an atomizing nozzle (1) and a roller body (2), the roller body (2) has a cavity for containing spray liquid, the cavity is communicated with the outside through a discharge port (202) arranged at the end of the roller body (2), and the atomizing nozzle (1) is detachably connected with the discharge port (202) through a first pipeline (3). A pump body for extracting the spray liquid in the cavity is arranged on the first pipeline (3).

2. The pole piece coater spray assembly of claim 1, wherein, The roller body (2) has coaxially arranged roller shafts (201) at both ends, at least one of the roller shafts (201) is arranged in a hollow cylindrical structure, the cavity is communicated with the outside through the hollow cylindrical structure, and the discharge port (202) is formed at the end of the roller shaft (201).

3. The pole piece coater spray assembly of claim 2, wherein, The roller body (2) has a discharge port (202) at one end, and a liquid supplementing port (203) for communicating the cavity with the outside is arranged at the opposite end, and a one-way valve which can be opened to the inside of the cavity is arranged at the liquid supplementing port (203).

4. The pole piece coater spray assembly of claim 3, wherein, The roller shaft (201) at the other end of the roller body (2) is arranged in a hollow cylindrical structure, and the liquid supplementing port (203) is formed at the end of the roller shaft (201). The spray assembly further comprises a spray liquid storage unit (8), and the liquid supplementing port (203) is connected with the spray liquid storage unit (8) through a second pipeline (4).

5. The pole piece coater spray assembly of claim 4, wherein, A third pipeline (5) for communicating the liquid supplementing port (203) with the discharge port (202) is further arranged in the cavity, and the third pipeline (5) is arranged in a coiled manner in the cavity.

6. The pole piece coater spray assembly of any of claims 1-5, wherein, Further comprising, A temperature detection unit for detecting the temperature of the surface of the roller body (2); A temperature adjusting unit for adjusting the temperature of the spray liquid entering the cavity; The temperature detection unit and the temperature adjusting unit are respectively in communication connection with the control unit.

7. The pole piece coater spray assembly of claim 6, wherein, The temperature adjusting unit is arranged in the spray liquid storage unit (8), and the spray assembly further comprises a fourth pipeline (6), a three-way valve (9) with two outlets is arranged at the discharge port (202), the first pipeline (3) and the fourth pipeline (6) are respectively connected with two outlets of the three-way valve (9), and the other end of the fourth pipeline (6) is connected with the spray liquid storage unit (8).

8. A transfer type electrode coating machine having a solvent spraying function, comprising a tank (12) and a coating roller (11) which dips the active material in the tank (12) and transfers it to the surface of a current collector, and a slurry transfer path which is formed on the surface of the coating roller (11) to transfer the slurry of the active material in the tank (12) to the surface of the current collector, characterized in that, The spray assembly comprises the spray assembly according to any one of claims 1-7, and the atomizing nozzle (1) of the spray assembly is arranged towards the slurry transfer path, and is used for spraying the solvent to the slurry transfer path during the slurry transfer process.

9. The transfer type electrode coating machine having a solvent spraying function according to claim 8, wherein Further comprising a doctor blade (10) for adjusting the thickness of the slurry on the surface of the coating roller (11), and a back roller which forms a slurry transfer gap with the coating roller (11), and the slurry transfer path is divided into two regions by the doctor blade (10); The atomizing nozzle (1) sprays the solvent to at least one of the two regions.

10. The transfer type electrode coating machine having a solvent spraying function according to claim 9, wherein The back roller has a cavity inside, and is used as the roller body (2) in the spray assembly.

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