CN112958368A

CN112958368A - Paste uniform-pressure device and method for solar cell printing

Info

Publication number: CN112958368A
Application number: CN202110155862.1A
Authority: CN
Inventors: 黄奉康; 张群; 冷青松; 耿心彤; 李鹏; 赵军
Original assignee: Jiangsu Zhengneng Electronic Technology Co ltd
Current assignee: Jiangsu Zhengneng Electronic Technology Co ltd
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-06-15
Anticipated expiration: 2041-02-04
Also published as: CN112958368B

Abstract

The invention provides a slurry uniform-pressure device and a slurry-pressure method for solar cell printing, wherein the slurry uniform-pressure device comprises a coating roller and a back roller, and a slit is formed between the coating roller and the back roller to extrude slurry; the roller body detection mechanism is used for detecting whether the bus bars of the coating roller and the back roller are parallel or not, the roller body detection mechanism is installed at the end part of the coating roller or the back roller, the roller body detection mechanism comprises a cover body, a point light source, a light response element and an alarm component, the point light source is installed on the end face of the coating roller or the back roller, the light emitting direction of the point light source faces the light response element, and the light response element is installed on a circuit board opposite to the point light source and used for generating electric signal change corresponding to light energy emitted by the; the alarm assembly is used for responding the electric signal change of the light response element and sending out an alarm signal. The invention can solve the problems of uneven slurry coating, corrugation on the surface of the slurry layer and the like, and can automatically detect the uniformity fluctuation in the coating process.

Description

Paste uniform-pressure device and method for solar cell printing

Technical Field

The invention belongs to the technical field of battery manufacturing, and particularly relates to a slurry uniform-pressure device and a slurry-pressure method for solar battery printing.

Background

The pole piece slurry coating is an important process in the production process of the solar cell, and means that slurry which is uniformly stirred is coated on positive and negative current collectors. Roll coating is a commonly used slurry coating mode, wherein two parallel press rolls synchronously rotate reversely during rolling, slurry is transferred to a pole piece substrate by utilizing the rotation of the two rolls, a coating roll rotates to enable the slurry to pass through a gap between the two rolls to form a uniform slurry layer, and then the pole piece is further compacted, dried and rolled.

During rolling, the pressure of the roller on the slurry is the resultant force of the vertical direction and the horizontal direction, the compaction density is mainly determined by the vertical pressure, and the elongation is mainly determined by the horizontal pressure. The coating uniformity mainly depends on the parallelism between the generatrices of the two rollers, and the coating uniformity is commonly used for evaluating the overall coating condition of one area. When two rollers appear the dislocation in the horizontal plane, fish scale line or water ripple can appear in the thick liquids layer surface, when two rollers appear the dislocation in vertical face, the thick liquids layer can appear about uneven phenomenon of thickness, has influenced the roughness of pole piece material, and the thickness deviation still can lead to the defect of rolling.

Chinese patent application No. CN201920781505.4 discloses a battery pole piece coating machine, which includes a first coating mechanism, a second coating mechanism and a winding and unwinding mechanism; receive unwinding mechanism and roll up with receiving the material including the blowing material, the blowing is rolled up the mass flow body that is used for installing the battery, and the mass flow body that the blowing was rolled up passes in proper order in succession first coating mechanism with second coating mechanism and rolling are rolled up on receiving the material and are rolled up, and first coating mechanism is used for scribbling on the mass flow body surface and establish the improvement nature thick liquids, and second coating mechanism is used for scribbling the mass flow body surface after establishing the improvement nature thick liquids and establishes the electrode slurry. The utility model discloses a pair of battery pole piece coating machine, the process that scribbles improvement thick liquids on the mass flow body and the process that scribbles electrode thick liquids on the mass flow body unite two into one, reduce the introduction of impurity such as dust, moisture of mass flow body coating improvement thick liquids in-process, establish good basis for producing the finished product electricity core that the performance is excellent later, are favorable to improving electric core performance. But the coating machine cannot solve the problem of uneven slurry coating.

Chinese patent with application number CN201720086499.1 discloses a membrane coating device that coats evenly, including unreeling roller, wind-up roll and locating the coating mechanism between unreeling roller and wind-up roll, coating mechanism is including being used for coating the first coating mechanism on the membrane with thick liquids and being used for coating even second coating mechanism with the thick liquids of coating on the membrane, second coating mechanism locates the rear of first coating mechanism, first coating mechanism includes first coating roller and is used for providing the thick liquids feed mechanism of thick liquids for first coating roller, second coating mechanism includes second coating roller, supplementary deflector roll and drive second coating roller pivoted drive element, the below of second coating roller is located to supplementary deflector roll, and during operation, the membrane passes between supplementary deflector roll and second coating roller. The beneficial effects are that: the slurry is uniformly coated on the diaphragm, so that the diaphragm is in close contact with the positive plate and the negative plate, and the energy density of the lithium battery can be kept while the safety performance of the lithium battery is ensured. The coating device can uniformly coat the slurry coated on the diaphragm, improve the flatness of the diaphragm, but cannot automatically detect the fluctuation of the uniformity and timely make adjustment when the coating uniformity is influenced by the fluctuation of the process in the coating process.

Disclosure of Invention

The invention aims to provide a slurry uniform-pressure device for solar cell printing, which is used for solving the problems of uneven slurry coating and unevenness such as ripples on the surface of a slurry layer and can automatically detect the uniformity fluctuation of the coating process; the invention also provides a grouting method of the pulp homogenizing device.

The invention provides the following technical scheme:

a paste homogenizing device for solar cell printing, comprising:

the coating roll and the back roll form a slit between the coating roll and the back roll to extrude the slurry;

the roll body detection mechanism is used for detecting whether the bus bars of the coating roll and the back roll are parallel or not, the roll body detection mechanism is installed at the end part of the coating roll or the back roll, the roll body detection mechanism comprises a cover body, a point light source, a light response element and an alarm component, the point light source is installed on the end face of the coating roll or the back roll, the light emitting direction of the point light source faces the light response element, and the light response element is installed on a circuit board opposite to the point light source and used for generating electric signal change corresponding to light energy emitted by the point light source; the alarm assembly is used for responding to the electric signal change of the light response element and sending an alarm signal;

the roller body correcting mechanism is used for automatically correcting a roller body to enable the coating roller to be parallel to a bus of the back roller; the roller body correcting mechanism comprises a supporting body, a correcting block and an adjusting driving assembly, wherein the supporting body is fixed on the rack, an arc correcting surface matched with the two shaft bodies is arranged on the correcting block, the correcting surface is far away from the shaft bodies in a normal state, and the adjusting driving assembly can drive the correcting block to move back and forth so that the correcting surface is corrected on the shaft bodies; the adjusting and driving assembly comprises a driving piece, a rack, a gear and a screw rod, two ends of the screw rod are respectively provided with thread grooves with opposite rotation directions, the correcting block is provided with a screw hole in threaded connection with the screw rod, and the installation depth of the screw rod in the screw hole can be adjusted; the middle part of the screw rod is fixedly provided with a gear meshed with the rack, the rack is arranged on the supporting body in a sliding mode, and the driving piece can drive the rack to move so as to rotate the screw rod.

Preferably, the coating roll and the back roll both comprise shaft bodies and roll bodies coaxially fixed on the shaft bodies, two ends of the shaft bodies extend out of the roll bodies and are installed in bearings of a support frame, the point light sources are installed on the central axis of the end faces of the shaft bodies, and the point light sources are lasers.

Preferably, the photoresponsive element is a photoresistor or a thermistor; the circuit board is provided with a null response area, the null response area is located on an extension line of a central axis of the shaft body, and the light response elements are distributed around the null response area.

Preferably, a plurality of light response elements are arrayed on the circuit board, and the light response elements are mutually connected in parallel.

Furthermore, a power supply, a switch and an electromagnet are further arranged on the circuit board, and the photoresponse element is connected in parallel and then connected in series with the power supply, the switch and the electromagnet to form a detection circuit.

Preferably, the cover body is made of light-blocking materials, the alarm assembly is installed on the cover body and comprises an actuation switch and an alarm terminal which are electrically connected, and the actuation switch is closed after the electromagnet is electrified to trigger the alarm terminal to send out an alarm signal.

Preferably, a chute is arranged in the cover body, the attraction type switch comprises a movable contact piece and a static contact piece which are arranged at intervals, the static contact piece is fixed on the cover body, the root part of the movable contact piece is arranged in the chute, and the movable contact piece can move horizontally along the chute to be attached to the static contact piece; the movable contact piece is fixed with a guide pillar, the other end of the guide pillar is inserted into a positioning blind hole in the cover body, an extension spring used for resetting the movable contact piece is sleeved on the guide pillar, and two ends of the extension spring are fixedly connected with the movable contact piece and the side wall of the sliding chute respectively.

Preferably, a support bar for supporting the rack is mounted on the support body, a convex blocking eave is arranged at the top of the support bar, and the blocking eave covers the outer side of the rack; the support body is further provided with a first guide groove and a second guide groove respectively, the first guide groove is used for guiding the movement of the correcting block, and the second guide groove is used for guiding the movement of the rack.

The invention also provides a grouting method for printing the solar cell, which is realized by adopting the slurry uniform-pressure device and comprises the following steps:

starting a driving motor of the coating roller and the back roller to enable the coating roller and the back roller to rotate in the reverse direction, and extruding the slurry into a continuous sheet through a slit between the coating roller and the back roller;

when the coating roller and the roller body of the back roller are parallel to each other in the horizontal plane and the vertical plane, light rays emitted by the point light source at the end part enter a null response area of the circuit board, the light response element is not triggered, the suction type switch of the alarm component is in an open state, and the slurry uniformly passes through the slit;

when the coating roller and the roller body of the back roller are inclined in the horizontal plane and/or the vertical plane, emergent light rays of the point light source are projected onto the photoresponsive element, the resistance of the photoresponsive element is reduced, the current in the detection circuit is increased rapidly, and larger current is provided for the electromagnet, so that the electromagnet can adsorb a movable contact piece of the suction type switch, trigger the alarm terminal to send out an alarm signal, inform an operator to adjust the roller body in time, and enable slurry to uniformly pass through the slit.

The invention has the beneficial effects that:

the roller body detection mechanism is arranged at the end part of the roller body and used for detecting whether the generatrices of the coating roller and the back roller are parallel or not, so that the phenomenon that the thicknesses of two sides are not uniform in the coating process or the fish scale pattern appears on the coating surface is avoided. The roller body detection mechanism comprises a point light source, a light response element and an alarm assembly, wherein the point light source is installed on the end face of the roller body, and does not emit light signals to the light response element when the point light source is in orthographic light. The invention supplies power to the electromagnet by the current intensity surge of the photoresponse element, so that the electromagnet can instantly adsorb the movable contact piece, the pull-in switch is closed, the alarm terminal is triggered to send out an alarm signal, and the action is accurate and reliable.

The parallelism between the roller bodies can be automatically detected, manual measurement by using a detection tool is not needed, and the operation is convenient and efficient; and the point light source is detected by the cooperation of the light response element, the light deflection degree of the point light source does not need to be observed by naked eyes, the damage of watching light to eyes is prevented, and the comfort level of detection is improved.

The roller body straightening mechanism is driven by the adjusting driving component to automatically straighten the roller bodies, so that the buses of the two roller bodies are parallel to each other, the adjusting process is quick and accurate, manual adjustment is not needed, and the labor intensity is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the aligned structure of the roll body of the present invention;

FIG. 2 is a schematic view of the construction of the present invention with the roll body deflected;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is an enlarged schematic view of portion B of FIG. 3;

FIG. 5 is a schematic cross-sectional view of the movable contact of the present invention installed in a chute;

FIG. 6 is a schematic diagram of the detection circuit of the present invention;

FIG. 7 is a schematic diagram of a structure in which the photoresponsive elements of the invention are distributed on a circuit board;

fig. 8 is a front view schematically showing the structure of the roll straightening mechanism of the present invention.

Labeled as: 1. a coating roll; 2. a backing roll; 3. a shaft body; 4. a roller body; 5. a support frame; 6. a frame; 7. a roller body detection mechanism; 8. a cover body; 9. a point light source; 10. a light responsive element; 11. a window; 12. a circuit board; 13. a power source; 14. a switch; 15. an electromagnet; 16. a null response region; 17. a pull-in switch; 18. an alarm terminal; 19. a chute; 20. a movable contact spring; 21. a static contact piece; 22. a guide post; 23. an extension spring; 24. positioning the blind hole; 25. a roller body straightening mechanism; 26. a support body; 27. a rectification block; 28. correcting the surface; 29. a thread groove; 30. a screw hole; 31. a supporting strip; 32. blocking eaves; 33. a first guide groove; 34. a second guide groove; 35. a drive member; 36. a rack; 37. a gear; 38. a screw.

Detailed Description

Example 1

As shown in fig. 1 to 7, a paste homogenizing device for solar cell printing comprises an application roller 1 and a back roller 2, wherein a slit is formed between the application roller 1 and the back roller 2 to press paste for solar cell pole piece printing, so that a paste layer is applied on a base material. The coating roller 1 and the back roller 2 both comprise a shaft body 3 and a roller body 4 coaxially fixed on the shaft body 3, and two ends of the shaft body 3 extend out of the roller body 4 and are installed in a bearing of the support frame 5. The support frame 5 and the side wall of the frame 6 are arranged in parallel and are fastened and connected through bolts, and the support frame 5 can be finely adjusted relative to the front and back positions of the frame 6 so as to adjust the slightly inclined roller bodies 4 and enable the two roller bodies 4 to be parallel to each other.

The roller body detection mechanism 7 is used for detecting whether the generatrices of the coating roller 1 and the back roller 2 are parallel or not, and is arranged at two ends of the coating roller 1 or the back roller 2. The roller body detection mechanism 7 comprises a cover body 8, a point light source 9, a light response element 10 and an alarm component.

Frame 6 is fixed in ground by the bolt, be equipped with the window 11 of fretwork in the outside of roll body 4 in frame 6, the cover body 8 is fixed in this window 11, the cover body 8 is made by opaque material, pointolite 9 is installed in coating roll 1 or the axis body terminal surface central authorities of backing roll 2, be located the axis body 3 promptly, and pointolite 9's light-emitting direction is towards light response component 10 perpendicularly, pointolite 9 preferred uses laser, its directive property is good, can avoid the parasitic light interference effectively, and laser is from taking certain heat energy, the light response component of being convenient for detects light energy sensitively. The laser power and energy of the point light source 9 should not be too high to damage or break down the light responsive element and its wavelength is selected within the wavelength range of visible light.

As shown in fig. 3 and 4, a circuit board 12 is mounted on the inner side wall of the housing 8 opposite to the point light source 9, and a light-responsive element 10 is mounted on the circuit board 12 for generating a change in an electrical signal in response to the light energy emitted from the point light source 9; the alarm assembly is adapted to emit an alarm signal in response to a change in the electrical signal of the light responsive element 10.

Specifically, the light-responsive elements 10 are photo-resistors or thermistors, a plurality of light-responsive elements 10 are arrayed on the circuit board 12, and the light-responsive elements 10 are connected in parallel. The circuit board 12 is further welded with a power supply 13, a switch 14 and an electromagnet 15, and the photoresponsive element 10 is connected in parallel and then connected in series with the power supply 13, the switch 14 and the electromagnet 15 to form a detection circuit as shown in fig. 6. The resistance value of the photoresistor or the thermistor is higher in a normal state, and the electromagnet 15 has no adsorption capacity due to weak current in the detection circuit; when laser light is incident on the light responsive element 10, the photo-resistor or the thermistor may instantaneously decrease the resistance in response to the intensity of the laser light or heat, resulting in instantaneous increase of current. When the current in the circuit increases to a threshold value, the electromagnet 15 is triggered to generate sufficient ferromagnetism to close the pull-in switch 17 of the alarm terminal 18.

As shown in fig. 3, 4 and 7, the circuit board 12 is provided with a null response region 16, the null response region 16 is located on an extension line of a central axis of the shaft body 3, and the plurality of light response elements 10 are distributed around the null response region 16. When the roller body 3 is not deflected, the point light source 9 is directed towards the null response region 16 and does not trigger the light responsive element 10.

The alarm component is arranged on the cover body 8 and comprises an attraction switch 17 and an alarm terminal 18 which are electrically connected, and the alarm terminal 18 is provided with a power supply and can also be connected to an external power supply. After the electromagnet 15 is electrified, the attraction switch 17 is closed to trigger the alarm terminal 18 to send out an alarm signal, and the alarm terminal 18 can be an acoustic alarm or an optical alarm.

As shown in fig. 4, a sliding groove 19 is provided in the cover 8, the pull-in switch 17 includes a movable contact piece 20 and a static contact piece 21 which are arranged at intervals, the static contact piece 21 is fixed on the cover 8, the root of the movable contact piece 20 is installed in the sliding groove 19, and the movable contact piece 20 can move horizontally along the sliding groove 19 to be attached to the static contact piece 21. A guide post 22 is fixed on the movable contact piece 20, the other end of the guide post 22 is inserted into a positioning blind hole 24 in the cover body 8, the guide post 22 can translate in the positioning blind hole 24 to guide the movement of the movable contact piece 20, an extension spring 23 is sleeved on the guide post 22, two ends of the extension spring 23 are respectively fixedly connected with the movable contact piece 20 and the chute 19, when the suction force of the electromagnet 15 to the movable contact piece 20 disappears, the extension spring 23 resets the movable contact piece 20 towards the direction of the initial position, and the suction type switch 17 is in an open state.

The working process of the device is as follows:

the point light sources can be lightened regularly, when the roller bodies of the coating roller 1 and the back roller 2 are parallel to each other in the horizontal plane and the vertical plane, light rays emitted by the point light sources 9 at the end parts enter the empty response area 16 of the circuit board 12, and the light response element 10 is not triggered, so that the current in the detection circuit is very small, sufficient current intensity cannot be provided for the electromagnet 15, and the attraction type switch 17 of the alarm component is in an open state. When the roller bodies of the coating roller 1 and the back roller 2 are inclined in a horizontal plane and/or a vertical plane, emergent light rays of the point light source 9 are projected onto the light response element 10, the resistance of the light response element 10 is rapidly reduced, the current in the detection circuit is rapidly increased, and larger current is provided for the electromagnet 15, so that the electromagnet can adsorb the movable contact piece 20 of the suction type switch 17, trigger the alarm terminal 18 to send out an alarm signal, and inform an operator to adjust the roller bodies in time.

Example 2

The difference between this embodiment and embodiment 1 is that a roller body straightening mechanism 25 is added, as shown in fig. 8, the roller body straightening mechanism 25 is installed on the frame 6, and when the alarm component sends an alarm signal, the roller body straightening mechanism 25 can automatically straighten the roller body 4, so that the bus bars of the coating roller 1 and the back roller 2 are parallel.

The roller body correcting mechanism 25 comprises a supporting body 26, a correcting block 27 and an adjusting driving assembly, the supporting body 26 is fixedly installed on the rack 6, an arc-shaped correcting surface 28 matched with the two shaft bodies 3 is arranged on the correcting block 27, and the correcting surface 28 does not contact with the shaft bodies 3 under a normal state, so that the shaft bodies 3 can rotate freely. Adjust drive assembly and can drive two correction piece 27 and remove mutually in the opposite directions and make correction face 28 stir the axis body 3 to adjust the axis body 3, make two axis bodies 3 all be parallel to each other in vertical plane and horizontal plane, prevent because roll body 4 highly inequality and appear thick liquids left and right sides thickness inequality in vertical plane, perhaps because roll body 4 has the stagger angle and makes the thick liquids layer of coating appear the fish scale line in the horizontal plane.

Specifically, the adjusting driving assembly comprises a driving piece 35, a rack 36, a gear 37 and a screw rod 38, two ends of the screw rod 38 are respectively provided with a thread groove 29 with opposite rotation directions, the correcting block 27 is provided with a screw hole 30 screwed with the screw rod 38, and the installation depth of the screw rod 38 in the screw hole 30 is adjustable; a gear 37 meshed with the rack 36 is fixed in the middle of the screw 38, the rack 36 is slidably mounted on the supporting body 26, the driving piece 35 can drive the rack 36 to move to rotate the screw 38, so that the two correcting blocks 27 synchronously move towards or away from each other, when the two correcting blocks 27 move towards each other, the correcting blocks 27 are far away from the shaft body 3, and when the two correcting blocks 27 move away from each other, the correcting blocks 27 gradually fit the shaft body 3, and in the process, because the positions of the correcting blocks 27 are accurate, the correcting blocks 27 finely adjust the shaft body 3 until the shaft body 3 is aligned. Preferably, a magnet layer is fixed on the correction surface 28 of the correction block 27, and can adsorb the shaft body 3, and for the condition that the heights of the two ends of the roller body 3 are different, one correction block 27 adsorbs the tilted end of the roller body, and the other correction block 27 jacks up the sunk end, so that the roller body 4 is kept in a horizontal state.

The supporting body 26 is provided with a supporting bar 31 for supporting the rack 36, the top of the supporting bar 31 is provided with a convex blocking eave 32, the blocking eave 32 covers the outer side of the rack 36, and the blocking eave 32 prevents the rack 36 from shaking in the moving process. The supporting body 26 is further provided with a first guide groove 33 and a second guide groove 34, the back surfaces of the straightening block 27 and the rack 36 are respectively provided with a first guide rail and a second guide rail which are matched with the first guide groove 33 and the second guide groove 34, the first guide groove 33 is used for guiding the movement of the straightening block 27, and the second guide groove 34 is used for guiding the movement of the rack 36, so that the movement accuracy and reliability of the straightening block 27 and the rack 36 are improved.

The optional cylinder of using of driving piece 35 or motor, install the controller on the frame 6, controller and touch-sensitive screen interconnect, be equipped with control switch on the touch-sensitive screen, driving piece 35 is connected to the controller, the alarm is behind the alarm level signal of controller output, the fastening bolt between support frame 5 and the frame 6 is loosened in the manual work, then the control switch of controller is pressed, the controller makes driving piece 35 move, drive correction block 27 carries out the automatic correction to roll body 4, make them all keep parallel in horizontal plane and vertical face, in order to guarantee the even coating of battery pole piece thick liquids layer.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A paste homogenizing device for solar cell printing, comprising:

2. The paste homogenizing device for solar cell printing according to claim 1, wherein the coating roller and the back roller each comprise a shaft body and a roller body coaxially fixed on the shaft body, two ends of the shaft body extend out of the roller body and are mounted in a bearing of a support frame, the point light source is mounted on an axial line of an end face of the shaft body, and the point light source is a laser.

3. The paste homogenizing device for solar cell printing according to claim 2, wherein the photoresponsive element is a photo-resistor or a thermistor; the circuit board is provided with a null response area, the null response area is located on an extension line of a central axis of the shaft body, and the light response elements are distributed around the null response area.

4. The paste homogenizing device for solar cell printing according to claim 3, wherein a plurality of light response elements are arrayed on the circuit board, and the light response elements are connected in parallel with each other.

5. The paste uniform-pressure device for solar cell printing according to claim 4, wherein the circuit board is further provided with a power supply, a switch and an electromagnet, and the photoresponsive element is connected in parallel and then connected in series with the power supply, the switch and the electromagnet to form a detection circuit.

6. The paste homogenizing device for solar cell printing according to claim 1, wherein the cover body is made of a light-blocking material, the alarm component is mounted on the cover body and comprises an actuation switch and an alarm terminal which are electrically connected, and the electromagnet is powered on to close the actuation switch to trigger the alarm terminal to send an alarm signal.

7. The paste homogenizing device for solar cell printing according to claim 6, wherein a chute is provided in the cover body, the pull-in switch comprises a movable contact piece and a static contact piece which are arranged at intervals, the static contact piece is fixed on the cover body, the root of the movable contact piece is installed in the chute, and the movable contact piece can move horizontally along the chute to be attached to the static contact piece; the movable contact piece is fixed with a guide pillar, the other end of the guide pillar is inserted into a positioning blind hole in the cover body, an extension spring used for resetting the movable contact piece is sleeved on the guide pillar, and two ends of the extension spring are fixedly connected with the movable contact piece and the side wall of the sliding chute respectively.

8. The paste homogenizing device for solar cell printing according to claim 1, wherein a support bar for supporting the rack is mounted on the support body, a convex blocking eave is arranged at the top of the support bar, and the blocking eave covers the outer side of the rack; the support body is further provided with a first guide groove and a second guide groove respectively, the first guide groove is used for guiding the movement of the correcting block, and the second guide groove is used for guiding the movement of the rack.

9. A paste discharging method for solar cell printing, characterized in that, the paste discharging method is realized by the paste even-pressure device of any one of claims 1 to 9, and the paste discharging method comprises the following steps:

starting a driving motor of the coating roll and the back roll to enable the coating roll and the back roll to rotate reversely, and coating the slurry on the base material through a slit between the coating roll and the back roll;