Glue printing scraper and glue printing device

Abstract

The utility model relates to a glue printing scraper and a glue printing device. The glue printing scraper comprises a glue storage cavity, a gravity cavity, a glue outlet cavity and a sealing gasket. The glue storage cavity is used for storing photosensitive glue, the gravity cavity is communicated with the glue storage cavity and is of a lengthwise structure in the height direction, the glue outlet cavity is communicated with the gravity cavity, a glue outlet is formed in the end face of the lower end of the glue outlet cavity, and the sealing gasket is arranged at the lower end of the glue outlet cavity and wraps the end face. And the sealing gasket is located between the glue outlet and the glue printing screen plate during glue printing and forms sealed abutting connection. The glue printing scraper is used for abutting against the glue printing screen plate so that the photosensitive glue can drop on a battery piece through glue outlet meshes of the glue printing screen plate to reinforce a welding strip of the battery piece, the longitudinal long structure can increase the pressure of the photosensitive glue on the upper portion on the photosensitive glue at the bottom of the glue outlet cavity, and rapid glue outlet is achieved. Closed abutting avoids the situation that a large number of bubbles are generated due to the fact that outside air makes contact with the photosensitive glue in the scraping process of the photosensitive glue during glue printing, and bubbles exist in glue points.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic modules, and in particular to a printing glue scraper and a printing glue device. Background Art

[0002] In the field of photovoltaic module technology, a battery string is composed of multiple battery cells. The silver paste points on multiple battery cells are heated to fuse and connect with the welding tape to form a battery string. However, when some types of battery cells form a battery string, the connection strength between the welding tape and the silver paste points decreases due to the small volume of the silver paste points on the battery cells, resulting in insufficient bonding between the battery cells and the welding tape, affecting the quality of the finished product of the battery string. Usually, a glue printing device is used to cover a layer of photosensitive glue on the bonding position of the welding tape and the silver paste points to enhance the connection strength between the battery cell and the welding tape. However, the glue printing device has problems such as slow glue discharge and bubbles in the glue points when printing glue. Summary of the invention

[0003] Based on this, it is necessary to provide a glue printing scraper and a glue printing device to address the problems of slow glue discharge from the glue printing device and bubbles in the glue dots.

[0004] The present application provides a rubber printing scraper, the rubber printing scraper comprising:

[0005] A glue storage cavity, wherein the glue storage cavity is used to store photosensitive glue;

[0006] A gravity cavity, which is arranged below the glue storage cavity and connected to the glue storage cavity, and has a longitudinal structure along the height direction;

[0007] A glue outlet cavity, which is arranged below the gravity cavity and connected to the gravity cavity, and a glue outlet is provided on an end surface of a lower end of the glue outlet cavity;

[0008] A closed gasket is arranged at the lower end of the glue outlet cavity and wraps the end surface, so that when printing glue, the closed gasket is located between the glue outlet and the glue printing screen to form a closed abutment.

[0009] In one of the embodiments, the printing glue scraper also includes a liquid level sensor, and the liquid level sensor is disposed in the glue storage cavity. The liquid level sensor is configured to be triggered and send a glue replenishment signal when the liquid level drops to a standard liquid level.

[0010] In one embodiment, the liquid level sensor includes a light receiver and a light emitter, the light emitter is configured to emit incident light at an angle relative to the photosensitive glue liquid level, and the light receiver is configured to receive the reflected light within a standard reflection range. When the photosensitive glue liquid level is above the standard liquid level, the reflected light is within the standard reflection range, and the light receiver can receive the reflected light. When the photosensitive glue liquid level is at or below the standard liquid level, the reflected light is outside the standard reflection range, and the light receiver cannot receive the reflected light, and the liquid level sensor is triggered and sends a glue replenishment signal.

[0011] In one embodiment, the glue printing scraper also includes a glue filling device, which includes a glue storage barrel, a glue filling tube, a control valve and a pressurizing device. The glue storage barrel is connected to the glue storage cavity through the glue filling tube. An air pressure space is reserved at the top of the glue storage barrel. The pressurizing device is connected to the air pressure space. The control valve is configured to control whether the glue filling tube is connected to the glue storage cavity. In response to the appearance of a glue filling signal, the control valve controls the glue filling tube to be connected to the glue storage cavity, and the pressurizing device pressurizes the air pressure space. In response to the disappearance of the glue filling signal, the control valve controls the glue filling tube to be disconnected from the glue storage cavity, and the pressurizing device does not pressurize the air pressure space.

[0012] In one of the embodiments, an annular groove is provided on the side of the closing gasket opposite to the end face of the lower end of the glue outlet cavity, the closing gasket is sleeved on the glue outlet through the annular groove, the outer side surface of the lower end of the glue outlet cavity has a matching groove, and the closing gasket has a matching block, which is matched and arranged in the matching groove.

[0013] In one of the embodiments, the cross-sectional area of ​​the gravity cavity and / or the cross-sectional area of ​​the glue outlet cavity along the horizontal direction is smaller than the cross-sectional area of ​​the glue storage cavity.

[0014] In one of the embodiments, the cross-sectional area of ​​the glue outlet cavity gradually decreases along the height direction and away from the glue storage cavity.

[0015] The present application also proposes a printing glue device, comprising:

[0016] The above-mentioned printing rubber scraper;

[0017] The printing rubber screen is provided with a glue outlet mesh hole, the printing rubber scraper is arranged above the printing rubber screen, and the printing rubber scraper is configured to abut against the printing rubber screen and reciprocate in the horizontal direction after the printing rubber screen is not deformed.

[0018] In one of the embodiments, the glue outlet mesh includes a plurality of rows of glue outlet holes arranged in sequence, and the opening size of the glue outlet is set to cover 1 to 3 rows of the glue outlet holes.

[0019] In one embodiment, the printing device further includes a conveyor belt, which is disposed below the printing screen, and the conveyor belt conveys the battery cells, and the width of the printing screen along the conveying direction of the conveyor belt is consistent with the width of the battery cells.

[0020] In the technical solution of the present application, the printing glue scraper is used to abut against the printing glue screen so that the photosensitive glue drips onto the battery cell through the glue outlet mesh holes of the printing glue screen to reinforce the soldering strip of the battery cell. The printing glue scraper includes a glue storage cavity, a gravity cavity and a glue outlet cavity in the direction close to the printing glue screen. The glue storage cavity can store a certain amount of photosensitive glue to ensure the working endurance of the printing glue scraper. The photosensitive glue in the glue storage cavity reaches the glue outlet cavity through the longitudinal structure of the gravity cavity. The longitudinal structure can increase the light from above. The pressure of the photosensitive glue on the photosensitive glue at the bottom of the glue discharge cavity is used to achieve rapid glue discharge; when the glue printing scraper abuts against the glue printing stencil, the closed gasket is located between the glue outlet and the glue printing stencil to form a closed abutment, so that when the photosensitive glue overflows onto the glue printing stencil through the glue outlet during the glue printing process, it can only flow to the battery cell through the glue discharge mesh holes on the glue printing stencil, and the photosensitive glue is connected to the outside world only through the glue discharge mesh holes, which avoids the outside air contacting the photosensitive glue during the photosensitive glue scraping process during glue printing to generate a large number of bubbles, resulting in bubbles in the glue points. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a schematic cross-sectional view of a rubber printing scraper and a rubber printing device according to an embodiment of the present application.

[0022] FIG. 2 is a schematic structural diagram of a rubber printing device according to an embodiment of a rubber printing scraper and a rubber printing device of the present application.

[0023] FIG. 3 is a schematic diagram of the structure of a rubber printing scraper and a liquid level sensor of an embodiment of a rubber printing device of the present application.

[0024] FIG. 4 is a schematic structural diagram of a rubber printing scraper and a rubber printing device according to an embodiment of the present application, in which the rubber printing scraper presses down a rubber printing screen.

[0025] FIG. 5 is a schematic structural diagram of a rubber printing stencil provided with a boss according to an embodiment of a rubber printing scraper and a rubber printing device of the present application.

[0026] FIG6 is a schematic structural diagram of an embodiment of a printing glue scraper and a printing glue device of the present application, in which the width of the printing glue screen is greater than the width of the battery cell.

[0027] FIG. 7 is a schematic structural diagram of an embodiment of a printing glue scraper and a printing glue device of the present application, in which the width of the printing glue screen is equal to the width of the battery cell.

[0028] Description of component numbers in the attached figure:

[0029] 1000, glue printing scraper; 100, glue storage chamber; 200, gravity chamber; 300, glue outlet chamber; 310, glue outlet; 400, closing gasket; 410, matching groove; 420, matching block; 500, liquid level sensor; 510, light receiver; 520, light transmitter; 530, reflected light; 540, incident light; 550, standard liquid level; 600, glue replenishing device; 610, glue storage barrel; 620, glue replenishing tube; 630, control valve; 640, pressurizing device; 700, glue printing screen; 710, glue outlet mesh; 720, boss; 730, deposited glue; 800, conveyor belt; 900, battery cell; 910, glue dots; 2000, glue printing device. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0036] Referring to FIG. 1 and FIG. 2 , FIG. 1 shows a cross-sectional schematic diagram of an embodiment of a printing rubber scraper 1000 of the present application, and FIG. 2 shows a schematic diagram of the structure of an embodiment of a printing rubber device 2000 of the present application. The present application proposes a printing rubber scraper 1000, which includes a glue storage cavity 100, a gravity cavity 200, a glue outlet cavity 300, and a closed gasket 400. The glue storage cavity 100 is used to store photosensitive glue. The gravity cavity 200 is arranged below the glue storage cavity 100 and is connected to the glue storage cavity 100, and the gravity cavity 200 has a longitudinal structure along the height direction. The glue outlet cavity 300 is arranged below the gravity cavity 200 and is connected to the gravity cavity 200, and a glue outlet 310 is provided on the end surface of the lower end of the glue outlet cavity 300. The sealing gasket 400 is disposed at the lower end of the glue outlet cavity 300 and wraps the end surface, so that when printing glue, the sealing gasket 400 is located between the glue outlet 310 and the glue printing screen 700 and forms a closed abutment.

[0037] The glue scraper 1000 is used to abut against the glue printing screen 700 so that the photosensitive glue drips onto the battery cell 900 through the glue outlet mesh 710 of the glue printing screen 700 to reinforce the welding strip of the battery cell 900. The glue scraper 1000 includes a glue storage cavity 100, a gravity cavity 200 and a glue outlet cavity 300 in sequence along the direction close to the glue printing screen 700, wherein the glue storage cavity 100 can store a certain amount of photosensitive glue to ensure the working endurance of the glue scraper 1000, and the photosensitive glue in the glue storage cavity 100 reaches the glue outlet cavity 300 through the longitudinal structure of the gravity cavity 200, and the longitudinal structure can increase the pressure of the photosensitive glue above on the photosensitive glue at the bottom of the glue outlet cavity 300 to achieve rapid glue discharge. When the glue printing scraper 1000 abuts against the glue printing stencil 700, the closed gasket 400 is located between the glue outlet 310 and the glue printing stencil 700 to form a closed abutment, so that when the photosensitive glue overflows onto the glue printing stencil 700 through the glue outlet 310 during the glue printing process, it can only flow onto the battery cell 900 through the glue outlet mesh 710 on the glue printing stencil 700, and the photosensitive glue is connected to the outside world only through the glue outlet mesh 710, thereby avoiding the situation in which the outside air contacts the photosensitive glue during the photosensitive glue scraping process during the glue printing process to generate a large number of bubbles, resulting in bubbles in the glue point 910.

[0038] Referring to FIG. 3 , the printing glue scraper 1000 further includes a liquid level sensor 500, which is disposed in the glue storage cavity 100. The liquid level sensor 500 is configured to be triggered and send a glue replenishment signal when the liquid level drops to a standard liquid level 550. The liquid level sensor 500 may be a capacitive sensor, a float inductive sensor, a photoelectric sensor, or other types of sensors, which are not specifically limited herein.

[0039] Exemplarily, the liquid level sensor 500 includes a light receiver 510 and a light emitter 520. The light emitter 520 is configured to emit an incident light 540 at an angle relative to the photosensitive glue liquid level. The light receiver 510 is configured to receive a reflected light 530 within a standard reflection range. When the photosensitive glue liquid level is above the standard liquid level 550, the reflected light 530 is within the standard reflection range, and the light receiver 510 can receive the reflected light 530. When the photosensitive glue liquid level is at or below the standard liquid level 550, the reflected light 530 is outside the standard reflection range, and the light receiver 510 cannot receive the reflected light 530. The liquid level sensor 500 is triggered and sends a glue replenishment signal.

[0040] Further, the printing glue scraper 1000 also includes a glue replenishing device 600, which includes a glue storage barrel 610, a glue replenishing tube 620, a control valve 630 and a pressurizing device 640. The glue storage barrel 610 is connected to the glue storage cavity 100 through the glue replenishing tube 620, and an air pressure space is reserved at the upper part of the glue storage barrel 610. The pressurizing device 640 is connected to the air pressure space, and the control valve 630 is configured to control whether the glue replenishing tube 620 is connected to the glue storage cavity 100. In response to the appearance of the glue replenishing signal, the control valve 630 controls the glue replenishing tube 620 to be connected to the glue storage cavity 100, and the pressurizing device 640 pressurizes the air pressure space. In response to the disappearance of the glue replenishing signal, the control valve 630 controls the glue replenishing tube 620 to be disconnected from the glue storage cavity 100, and the pressurizing device 640 does not pressurize the air pressure space. During the printing process, the printing scraper 1000 can ensure the supply of photosensitive glue through the liquid level sensor 500 and the glue replenishing device 600, continuously perform the printing work, and improve the endurance of the printing scraper 1000.

[0041] The connection mode between the closed gasket 400 and the glue outlet 310 is determined according to the actual situation and is not specifically limited here. The material of the closed gasket 400 can be a soft elastic material such as rubber, silicone, etc., which is not specifically limited here. Exemplarily, the closed gasket 400 is provided with an annular groove on the side opposite to the end face of the lower end of the glue outlet cavity 300, and the closed gasket 400 is sleeved on the glue outlet 310 through the annular groove. The outer side surface of the lower end of the glue outlet cavity 300 has a matching groove 410, and the closed gasket 400 has a matching block 420, which is matched and arranged in the matching groove 410. The closed gasket 400 is connected by the matching block 420 and the matching groove 410 of the glue outlet cavity 300, which can improve the installation reliability of the closed gasket 400.

[0042] Optionally, the cross-sectional area of ​​the gravity cavity 200 and / or the cross-sectional area of ​​the glue discharge cavity 300 along the horizontal direction is smaller than the cross-sectional area of ​​the glue storage cavity 100, and the cross-sectional area of ​​the glue discharge cavity 300 gradually decreases along the height direction and in the direction away from the glue storage cavity 100. Such a setting is conducive to ensuring the glue discharge speed of the photosensitive glue on the one hand, and on the other hand, the cross-sectional area of ​​the gravity cavity 200 and / or the cross-sectional area of ​​the glue discharge cavity 300 is small, which can leave a large space above the glue printing stencil 700 when the glue printing scraper 1000 moves along the glue printing stencil 700, avoiding the large volume of the cavity blocking the surface of the glue printing stencil 700 and causing interference. After leaving enough space, the cross-sectional area of ​​the glue storage cavity 100 above the gravity cavity 200 can be set larger, so that the glue storage cavity 100 has a larger capacity and can store more photosensitive glue.

[0043] The shapes of the gravity cavity 200 and the glue outlet cavity 300 are determined according to actual applications and are not specifically limited herein. Exemplarily, the gravity cavity 200 has a cylindrical structure, and the glue outlet cavity 300 has a conical structure.

[0044] Referring to FIG. 2 , the present application further proposes a printing device 2000, comprising the above-mentioned printing scraper 1000 and the printing screen 700. The printing screen 700 is provided with a printing mesh hole 710, and the printing scraper 1000 is arranged above the printing screen 700. The printing scraper 1000 is configured to abut against the printing screen 700 and reciprocate in the horizontal direction without deforming the printing screen 700. Referring to FIG. 4 , FIG. 4 shows a schematic diagram of the structure of the printing scraper 1000 pressing the printing screen 700. Usually, the movement process of the printing glue scraper 1000 on the printing glue stencil 700 is that the printing glue scraper 1000 abuts against and presses down the printing glue stencil 700 and then moves back and forth on the printing glue stencil 700. This movement mode will cause the middle part of the printing glue stencil 700 to be concave and deformed downward, making the glue dots 910 dropped on the middle part of the battery cell 900 more rounded and thick, while the glue dots 910 located at the edge of the battery cell 900 are relatively thin, resulting in uneven glue dots 910 of the printing glue. In view of this, the present application configures the printing glue scraper 1000 to abut against the printing glue stencil 700 and move back and forth in the horizontal direction after the printing glue stencil 700 is not deformed. When the printing glue scraper 1000 moves on the printing glue stencil 700, it will not cause the printing glue stencil 700 to be concave and deformed, and the glue dots 910 of the printing glue are uniform, thereby improving the service life of the stencil.

[0045] The opening size of the glue outlet 310 is determined according to the actual application and is not specifically limited here. If the opening size of the glue outlet 310 is too large, the risk of glue leakage will increase. If the opening size of the glue outlet 310 is too small, the glue printing efficiency will be low. For example, the glue outlet mesh 710 includes multiple rows of glue outlet holes arranged in sequence, and the opening size of the glue outlet 310 is set to cover 1 to 3 glue outlet holes.

[0046] Optionally, the opening size of the glue outlet 310 is set to cover two rows of glue holes.

[0047] Referring to FIGS. 5 to 7 , FIG. 5 shows a schematic diagram of the structure of a printing screen 700 provided with a boss 720, FIG. 6 shows a schematic diagram of the structure in which the width of the printing screen 700 is greater than the width of the battery cell 900, and FIG. 7 shows a schematic diagram of the structure in which the width of the printing screen 700 is equal to the width of the battery cell 900. The printing device 2000 further includes a conveyor belt 800, which is disposed below the printing screen 700 and conveys the battery cell 900. The conveying direction of the conveyor belt 800 is shown in the direction of arrow C in FIG. 2 , and the moving direction of the printing scraper 1000 is shown in the arrow A and arrow B in FIG. 2 , and the printing scraper 1000 reciprocates along the A direction and the B direction. Usually, the width of the printing glue stencil 700 is larger than the width of the battery cell 900. This setting will cause the printing glue stencil 700 to scrape the glue dots 910 on the battery cell 900 before the printing glue is completely off the printing glue stencil 700, and the glue dots 910 on the battery cell 900 before solidification (see FIG. 6). Over a long period of time, the residual glue scraped by the printing glue stencil 700 will solidify and will crack the battery cell 900 to be printed with glue later. 0, so a boss 720 is usually set for the printing glue stencil 700 (see FIG. 5) to prevent the printing glue stencil 700 from rubbing against the glue dots 910 on the front battery cell 900. However, the printing glue stencil 700 provided with the boss 720 is prone to produce accumulated glue 730 at the boss 720, resulting in excessive glue near the boss 720, larger glue dots 910 near the boss 720, and higher height of the glue dots 910, which affects the uniformity of the glue dots 910 of the battery cell 900. In view of this, the printing glue stencil 700 is configured so that the width of the printing glue stencil 700 is consistent with the width of the battery cell 900 along the conveying direction of the conveyor belt 800 (see FIG. 7). Such a configuration can prevent the printing glue stencil 700 from rubbing against the glue dots 910 on the front battery cell 900, and there is no accumulation of glue due to the boss 720.

[0048] The glue printing scraper 1000 abuts against the glue printing screen 700 so that the photosensitive glue drips onto the battery cell 900 through the glue outlet mesh 710 of the glue printing screen 700 to fix the soldering strip of the battery cell 900. The glue printing device 2000 is suitable for glue printing reinforcement of battery strings formed by battery cells 900 with small silver paste dots, especially when compared with conventional battery cells, the number of main grids of the battery cell 900 is small or there is no main grid. The glue printing device 2000 can further strengthen the connection strength between the silver paste dots and the soldering strips of the battery cell 900.

[0049] After the printing of the adhesive, the cell 900 enters the curing process. The curing process is determined according to the actual application and is not specifically limited here. Exemplarily, the curing process method is ultraviolet irradiation.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A rubber printing scraper, characterized in that: The printing rubber scraper comprises: A glue storage cavity, wherein the glue storage cavity is used to store photosensitive glue; A gravity cavity, which is arranged below the glue storage cavity and connected to the glue storage cavity, and has a longitudinal structure along the height direction; A glue outlet cavity, which is arranged below the gravity cavity and connected to the gravity cavity, and a glue outlet is provided on an end surface of a lower end of the glue outlet cavity; A closed gasket is arranged at the lower end of the glue outlet cavity and wraps the end surface, so that when printing glue, the closed gasket is located between the glue outlet and the glue printing screen and forms a closed abutment.

2. The rubber printing scraper according to claim 1, characterized in that: The printing glue scraper also includes a liquid level sensor, which is disposed in the glue storage cavity. The liquid level sensor is configured to be triggered and send a glue replenishing signal when the liquid level drops to a standard liquid level.

3. The rubber printing scraper according to claim 2, characterized in that: The liquid level sensor includes a light receiver and a light emitter. The light emitter is configured to emit incident light at an angle relative to the photosensitive glue liquid level. The light receiver is configured to receive reflected light within a standard reflection range. When the photosensitive glue liquid level is above the standard liquid level, the reflected light is within the standard reflection range, and the light receiver can receive the reflected light. When the photosensitive glue liquid level is at or below the standard liquid level, the reflected light is outside the standard reflection range, and the light receiver cannot receive the reflected light.

4. The rubber printing scraper according to claim 2, characterized in that: The glue printing scraper also includes a glue filling device, which includes a glue storage barrel, a glue filling tube, a control valve and a pressurizing device. The glue storage barrel is connected to the glue storage cavity through the glue filling tube. An air pressure space is reserved on the upper part of the glue storage barrel. The pressurizing device is connected to the air pressure space. The control valve is configured to control whether the glue filling tube is connected to the glue storage cavity. In response to the appearance of a glue filling signal, the control valve controls the glue filling tube to be connected to the glue storage cavity, and the pressurizing device pressurizes the air pressure space. In response to the disappearance of the glue filling signal, the control valve controls the glue filling tube to be disconnected from the glue storage cavity, and the pressurizing device does not pressurize the air pressure space.

5. The rubber printing scraper according to claim 1, characterized in that: The closing gasket is provided with an annular groove on one side opposite to the end face of the lower end of the glue outlet cavity, and the closing gasket is sleeved on the glue outlet through the annular groove. The outer side face of the lower end of the glue outlet cavity is provided with a matching groove, and the closing gasket is provided with a matching block, and the matching block is matched and arranged in the matching groove.

6. The rubber printing scraper according to claim 1, characterized in that: The cross-sectional area of ​​the gravity cavity and / or the cross-sectional area of ​​the glue outlet cavity along the horizontal direction is smaller than the cross-sectional area of ​​the glue storage cavity.

7. The rubber printing scraper according to claim 1, characterized in that: Along the height direction and in the direction away from the glue storage cavity, the cross-sectional area of ​​the glue outlet cavity gradually decreases.

8. A rubber printing device, characterized in that: include: The rubber printing scraper as claimed in any one of claims 1 to 7; The printing rubber screen is provided with a glue outlet mesh hole, the printing rubber scraper is arranged above the printing rubber screen, and the printing rubber scraper is configured to abut against the printing rubber screen and reciprocate in the horizontal direction after the printing rubber screen is not deformed.

9. The rubber printing device according to claim 8, characterized in that: The glue outlet mesh includes multiple rows of glue outlet holes arranged in sequence, and the opening size of the glue outlet is set to cover 1 to 3 rows of the glue outlet holes.

10. The rubber printing device according to claim 8, characterized in that: The printing glue device also includes a conveyor belt, which is arranged below the printing glue screen. The conveyor belt conveys battery cells. The width of the printing glue screen along the conveying direction of the conveyor belt is consistent with the width of the battery cells.

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