Spraying method

Abstract

The invention relates to the technical field of battery production, and discloses a spraying method, the spraying method is used for spraying a battery, and the spraying method comprises the following steps: placing the battery in place; filling: carrying out filling operation on the second surface of the battery through the filling device; primary curing: curing the coating covering the second surface of the battery through the primary curing device; spraying: performing spraying operation on the end surface of the battery through the spraying device so as to spray paint to the end surface of the battery; secondary curing: curing the coating sprayed on the battery through a secondary curing device; according to the spraying method provided by the invention, the filling step, the primary curing step, the spraying step and the secondary curing step are sequentially carried out on the battery, so that the aluminum leakage problem of the battery can be avoided, and the overall insulating property of the battery is improved.

Description

Technical Field

[0001] The invention relates to the technical field of battery production, in particular to a spraying method. Background Art

[0002] In order to ensure the insulation performance of the battery casing, an insulating film is generally attached to the outer wall of the shell or an insulating paint is applied. Among them, the method of spraying insulating paint has better insulation performance and anti-puncture performance, which effectively protects the stability and safety of the battery.

[0003] The end faces of batteries often have complex structural features; specifically, many battery end faces have a first face and a second face of different heights, and there is a structural drop between the two faces; and current spraying technology is difficult to fully cover the battery end faces with a structural drop; during the spraying process, the paint cannot fully and evenly adhere to the end face of the battery with a structural drop, so that part of the end face cannot be effectively sprayed, which will cause aluminum leakage, that is, the aluminum material is exposed in the area not protected by the spraying; and the exposure of aluminum will greatly reduce the insulation performance of the battery, and then cause poor insulation problems; this poor insulation problem may cause a series of safety hazards such as short circuit and leakage during the subsequent use of the battery, seriously affecting the performance and service life of the battery, and may even pose a threat to the safety of equipment and personnel using the battery; therefore, a new battery spraying method is urgently needed to overcome the defects of the above-mentioned prior art. Summary of the invention

[0004] Aiming to solve at least one of the technical problems existing in the prior art, the present invention aims to provide a spraying method, which is used for spraying batteries and can improve the overall insulation performance of the battery.

[0005] In order to achieve the above object, the present invention provides a spraying method for spraying a battery, wherein the battery has an end surface, the end surface includes a first surface and a second surface, and the height of the first surface is higher than the second surface; the spraying method comprises the following steps:

[0006] Battery in place: The battery is transported to the dispensing station by a conveying device;

[0007] Filling: When the battery is placed in the dispensing station, a filling device is used to fill the second surface of the battery, so that the coating covers the second surface of the battery to form a filling layer;

[0008] Primary curing: transporting the battery to a primary curing station corresponding to a primary curing device through the conveying device, and curing the coating covering the second surface of the battery through the primary curing device;

[0009] Spraying: transporting the battery to a spraying station corresponding to a spraying device through the conveying device, and spraying the end surface of the battery through the spraying device to spray the coating onto the end surface of the battery;

[0010] Secondary curing: The battery is transported to a secondary curing station corresponding to a secondary curing device by the conveying device, and the coating sprayed on the end surface of the battery is cured by the secondary curing device.

[0011] Compared with the prior art, a spraying method according to an embodiment of the present invention has the following beneficial effects: first, a filling device is used to fill the second side of the end face of the battery with a lower height, so that the paint can be filled to the second side of the battery and the structural drop between the second side and the first side due to the height difference. The filled paint forms a relatively flat filling layer on the second side, ensuring that the second side is fully covered and tightly attached by the paint before the subsequent spraying step; when the spraying device is used to spray the end face of the battery, the insulating paint can be more evenly distributed on the entire end face of the battery, including the transition part between the first side and the second side. The structure of the first side and the second side of the battery is preferably made of a thin layer of aluminum, and the second side of the battery is preferably made of a thin layer of aluminum. The structure of the second side and the first ... BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a spraying production line provided by an embodiment of the present invention;

[0013] Figure 2 is a schematic structural diagram of a battery provided by an embodiment of the present invention;

[0014] Figure 3 is a structural schematic diagram of a filling device provided by an embodiment of the present invention;

[0015] Figure 4 is a structural schematic diagram of a filling device provided by an embodiment of the present invention after omitting the first driving device;

[0016] Figure 5 It is a structural schematic diagram of a one-time curing device provided by an embodiment of the present invention;

[0017] Figure 6 is a schematic structural diagram of a conveying device provided by an embodiment of the present invention with the conveying belt omitted;

[0018] Figure 7 is a structural schematic diagram of a spraying device provided by an embodiment of the present invention;

[0019] Figure 8 It is a schematic diagram of the structure inside a spray chamber of a spray device provided by an embodiment of the present invention;

[0020] Fig. 9 is a structural schematic diagram of a secondary curing device provided by an embodiment of the present invention;

[0021] Fig.10 It is a schematic diagram of a spraying method provided by an embodiment of the present invention.

[0022] In the figure, 1, conveying device; 11, conveyor belt; 12, vacuum positioning fixture; 13, rotation driving device; 121, first mounting frame; 122, vacuum suction cup;

[0023] 2. Filling device; 21. Storage barrel; 22. Discharging hose; 23. Dispensing valve; 24. First driving device; 25. Air inlet pipe; 26. Pressure relief valve; 27. Pressure sensor; 28. Stirring motor; 29. ​​Liquid level sensor;

[0024] 3. primary curing device; 31. second mounting frame; 32. pre-curing lamp; 321. light output groove;

[0025] 4. Spraying device; 41. Spraying room; 42. Second driving device; 43. Spray gun;

[0026] 5. Secondary curing device; 51. First bracket; 52. First curing light; 53. Second bracket; 54. Second curing light.

[0027] 6. Battery; 60. End face; 61. First face; 62. Second face; 611. First first face; 612. Second first face; 621. First second face; 622. Second second face. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0035] like Figure 1 As shown, an embodiment of the present invention provides a spraying production line, including a conveying device 1, a filling device 2, a primary curing device 3, a spraying device 4 and a secondary curing device 5. The filling device 2, the primary curing device 3, the spraying device 4 and the secondary curing device 5 are arranged in sequence along the moving direction of the conveying device 1. The spraying production line can be used to implement the following spraying method.

[0036] See also Figure 2 An embodiment of the present invention provides a battery 6 , wherein the battery 6 has an end surface 60 , wherein the end surface 60 includes a first surface 61 and a second surface 62 , and the height of the first surface 61 is higher than that of the second surface 62 .

[0037] The spraying method provided by the present invention is described below by taking the end surface 60 at the top of the battery 6 as an example, that is, the end surface 60 described below is the top surface of the battery 6 .

[0038] The following spraying method of the present invention is described by taking a cylindrical battery 6 as an example. In the cylindrical battery 6, the first surface 61 includes a first first surface 611 and a second first surface 612. The second surface 62 includes a first second surface 621 and a second second surface 622. The first second surface 621 is a first annular surface, and the second second surface 622 is a second annular surface.

[0039] It is understandable that the present invention can be applied to the production of various types of batteries, such as cylindrical batteries, square-shell batteries, blade batteries, and special-shaped batteries. The following spraying method is explained by taking the spraying of cylindrical batteries as an example, but the present invention is not limited to this.

[0040] See also Figure 1-Figure 10 The present invention provides a spraying method for spraying a battery 6, the spraying method comprising the following steps:

[0041] The battery 6 is in place: the battery 6 is transported to the dispensing station by the conveying device 1;

[0042] Filling: When the battery 6 is placed at the dispensing station, the second surface 62 of the battery 6 is filled by the filling device 2 to cover the second surface 62 of the battery 6 with the coating to form a filling layer;

[0043] Primary curing: The battery 6 is transported to the primary curing station corresponding to the primary curing device 3 by the conveying device 1, and the coating covering the second surface 62 of the battery 6 is cured by the primary curing device 3;

[0044] Spraying: The battery 6 is transported to the spraying station corresponding to the spraying device 4 by the conveying device 1, and the end surface of the battery 6 is sprayed by the spraying device 4 to spray the coating onto the end surface of the battery 6;

[0045] Secondary curing: The battery 6 is transported to the secondary curing station corresponding to the secondary curing device 5 by the conveying device 1, and the coating sprayed on the end surface of the battery 6 is cured by the secondary curing device 5.

[0046] Based on this technical solution, the filling device 2 is first used to fill the second surface 62 of the end surface 60 of the battery 6 with a lower height, so that the paint can be filled to the second surface 62 of the battery 6 and the structural drop between the second surface 62 and the first surface 61 due to the height difference. The filled paint forms a relatively flat filling layer on the second surface 62, ensuring that the second surface 62 is fully covered and tightly adhered by the paint before the subsequent spraying step; when the spraying device 4 is used to spray the end surface 60 of the battery 6, the insulating paint can be more evenly distributed on the entire end surface 60 of the battery 6, including the transition portion between the first surface 61 and the second surface 62 (i.e., the first surface 61). The structure difference between the second surface 62 and the first surface 61 due to the height difference can effectively avoid uneven spraying thickness and discontinuous coating at the structure difference at the junction of the first surface 61 and the second surface 62 of the battery 6, ensuring that the coating can fully and completely cover the entire end surface 60 of the battery 6, thereby avoiding aluminum leakage from the battery 6, avoiding poor insulation of the battery 6 due to aluminum exposure, improving the overall insulation performance of the battery 6, reducing the safety risks of short circuit, leakage, etc. caused by insulation failure during use of the battery 6, and ensuring the safety and stability of the battery 6 in various electronic equipment or power systems.

[0047] Preferably, the height of the filling layer is A, and the height difference between the first surface 61 and the second surface 62 is B, which satisfies: 0.75≤A / B≤1. By limiting 0.75≤A / B≤1, the filling layer can effectively fill the recessed area formed by the structural drop of the second surface 62; this means that the filling layer will not be too high to waste materials, nor too low to fully cover the recessed area, thereby ensuring the effective coverage of the second surface 62 of the battery 6 by the filling layer, reducing the occurrence of aluminum leakage, and preventing poor insulation problems caused by aluminum leakage on the end face of the battery 6; the adaptability of the filling layer to the structural drop helps to improve the stability of the filling layer. Within this range, the filling layer can better fit the second surface 62 of the battery 6, avoiding adhesion problems caused by improper thickness of the filling layer.

[0048] In this embodiment, the coating material is insulating paint.

[0049] The spraying method also includes a visual edge positioning step, which is arranged after the battery 6 is in place step and before the primary curing step; in the visual edge positioning step, the image information data of the end face of the battery 6 is collected by a visual inspection device and the image information data is analyzed and identified to obtain the position data and shape and size data of the second side 62 of the battery 6. In this way, the filling device 2 can accurately position the second side 62 of the battery 6 based on the position data and shape and size data of the second side 62, so as to ensure the accuracy and consistency of the dispensing operation of the second side 62.

[0050] Specifically, the visual inspection equipment includes a camera and an image analysis and processing unit. The camera can obtain a clear image of the end face 60 of the battery 6. The image analysis and processing unit analyzes the image, compares it with a preset standard image, and analyzes and identifies the position data and shape and size data of the second side 62 of the end face 60.

[0051] In the spraying step, the side of the battery 6 is also sprayed by the spraying device 4 to spray the insulating paint to the side of the battery 6. Specifically, the spraying device 4 may spray the side of the battery 6 and the end face 60 of the battery 6 at the same time, or spray the end face 60 of the battery 6 first and then spray the side of the battery 6, or spray the side of the battery 6 first and then spray the end face 60 of the battery 6.

[0052] The voltage resistance and insulation performance of the battery after spraying are evaluated in combination with specific experimental examples and comparative examples.

[0053] Specifically, the evaluation method of the battery's voltage resistance performance is:

[0054] (1) Select a suitable DC withstand voltage tester whose output voltage range should meet the requirements of battery withstand voltage test; prepare a test fixture to connect the battery;

[0055] (2) Place the battery on a well-insulated test platform and ensure that the environment around the battery is dry and free of conductive objects. Use a test fixture to connect the high-voltage output terminal of the withstand voltage tester to the positive electrode of the battery, and the ground terminal of the tester to the negative electrode or shell of the battery (if the test battery shell is connected to the negative electrode).

[0056] (3) Increase the test voltage at a preset rate, and control the voltage rise rate between 100-500V per second. During the voltage rise process, closely observe the current value and battery status displayed by the tester. When the voltage reaches the preset test voltage value of 2800V, maintain this voltage for 1min-5min.

[0057] (4) While maintaining the voltage, record the leakage current displayed by the tester; if the leakage current always remains within the specified range (leakage current is less than 1mA) and the battery does not show abnormal phenomena such as breakdown, smoking, and heat, then the DC withstand voltage performance of the battery is judged to be qualified.

[0058] Specifically, the insulation performance of the battery is evaluated as follows:

[0059] (1) Select a suitable insulation resistance tester and choose a suitable test voltage level according to the rated voltage of the battery; prepare a test fixture to connect the battery;

[0060] (2) Place the battery on a well-insulated workbench and ensure that the battery surface is clean and dry; use a test fixture to connect the high-voltage output terminal of the insulation resistance tester to one electrode of the battery (such as the positive electrode), and the ground terminal of the tester to the battery casing or another electrode (such as the negative electrode);

[0061] (3) Turn on the insulation resistance tester, apply the selected test voltage of 500V, and wait for the tester to display a stable insulation resistance value. The insulation resistance value is qualified if it is greater than 200MΩ.

[0062] The experimental examples and comparative examples provided in the following table are obtained by spraying using the spraying method provided by the present invention, and the comparative examples are obtained by using a conventional spraying method. The difference between the conventional spraying method and the spraying method of the present invention is that the conventional spraying method lacks the filling step and the one-time curing step of the invention, and other conditions are the same. The specific evaluation results are shown in Table 1 below:

[0063]

[0064]

[0065] Table 1

[0066] As can be seen from Table 1, the leakage currents of the batteries of Experimental Examples 1-3 are all less than 1 mA, that is, the qualified rate of the withstand voltage performance of the batteries obtained by the spraying method provided by the present invention is 100%, while the leakage currents of the batteries of Comparative Examples 1-3 are all greater than 1 mA, that is, the qualified rate of the withstand voltage performance of the batteries obtained by the conventional spraying method is 0; the insulation resistance values ​​of the batteries of Experimental Examples 1-3 are all greater than 200 MΩ, that is, the qualified rate of the insulation performance of the batteries obtained by the spraying method provided by the present invention is 100%, while the insulation resistance values ​​of the batteries of Comparative Examples 1 and 3 are all less than 200 MΩ, and the insulation resistance value of Comparative Example 2 is greater than 200 MΩ, that is, the qualified rate of the insulation performance of the batteries obtained by the conventional spraying method is 33%; therefore, the battery obtained by the spraying method provided by the present invention can improve the insulation performance of the battery as a whole, reduce the safety risks of short circuit, leakage, etc. caused by insulation failure during use of the battery, and ensure the safety and stability of the battery used in various electronic devices or power systems.

[0067] See also Figure 3-Figure 9 A conveying device 1 provided in an embodiment of the present invention includes a conveying belt 11 and a vacuum positioning fixture 12. The vacuum positioning fixture 12 is connected to the conveying belt 11 and is used to adsorb and fix the battery 6.

[0068] A filling device 2 provided in an embodiment of the present invention includes a material storage barrel 21, a discharge hose 22, a dispensing valve 23 and a first driving device 24. The material storage barrel 21 is connected and communicated with the dispensing valve 23 through the discharge hose 22. The dispensing valve 23 is used to perform a filling operation on the second surface 62 of the battery 6. The first driving device 24 is connected to the dispensing valve 23 and can drive the dispensing valve 23 to move. Specifically, when the battery 6 is adsorbed and fixed on the vacuum positioning fixture 12 and conveyed to the dispensing station through the conveyor belt 11, the first driving device 24 drives the dispensing valve 23 to move to the top of the second surface 62, and the dispensing valve 23 covers the coating to the second surface 62 of the battery 6 to form a filling layer.

[0069] By adopting the design in which the first driving device 24 is connected to the dispensing valve 23, the dispensing valve 23 can flexibly adapt to batteries 6 of different shapes, sizes and slightly different placement postures on the vacuum positioning fixture 12; specifically, by accurately controlling the relative movement of the dispensing valve 23 and the vacuum positioning fixture 12 through the driving mechanism, the dispensing valve 23 can approach and cover the second surface 62 of the battery 6 from all angles and directions, even some hidden or difficult to directly contact parts on the second surface 62, thereby ensuring that the insulating paint smoothly covers the second surface 62, thereby comprehensively improving the adaptability and processing capabilities of the filling device 2 to the second surface 62, and improving the versatility and reliability of the spraying method on different battery 6 products.

[0070] The conveyor belt 11 mechanism may include but is not limited to a belt conveyor belt 11 , a roller conveyor belt 11 and a chain conveyor belt 11 .

[0071] In this embodiment, the first driving device 24 is a three-axis translation driving device, and the first driving device 24 is used to drive the dispensing valve 23 to perform translational motion along the X-axis, Y-axis and Z-axis to translate the dispensing valve 23 to the first second surface 621 or the second second surface 622 of the battery 6.

[0072] The conveying device 1 also includes a rotation drive device 13; the vacuum positioning fixture 12 includes a first mounting frame 121 and a vacuum suction cup 122, the first mounting frame 121 is connected to the conveyor belt 11, the vacuum suction cup 122 is connected to the first mounting frame 121, the rotation drive device 13 is installed on the first mounting frame 121, the rotation drive device 13 is connected to the vacuum suction cup 122 and can drive the vacuum suction cup 122 to rotate around the central axis of the vacuum suction cup 122; specifically, when the battery 6 is adsorbed and fixed on the vacuum suction cup 122, and the vacuum positioning fixture 12 is placed at the dispensing station, the rotation drive device 13 drives the vacuum suction cup 122 to rotate around the central axis of the vacuum suction cup 122.

[0073] The rotary drive device 13 drives the vacuum suction cup 122 to rotate around its central axis, so that the vacuum suction cup 122 can drive the battery 6 to rotate. The rotation of the battery 6 diversifies the application direction of the insulating paint on the second surface 62. Compared with the fixed dispensing method, the paint can be attached at an angle that is more in line with the structural characteristics of each part of the second surface 62, thereby enhancing the bonding strength between the paint and the end face 60 of the battery 6, reducing problems such as peeling and flaking caused by paint accumulation or loose adhesion, and improving the quality of the insulating paint layer after dispensing, laying a more solid foundation for the subsequent primary curing and insulation protection of the entire end face 60 of the battery 6.

[0074] In this embodiment, the rotation driving device 13 includes a driving motor, a driving gear, a transmission chain and a driven gear. The driving gear is fixedly connected to the output end of the driving motor, and the driven gear is sleeved and fixed on the connecting shaft of the vacuum suction cup 122. The driving gear is connected to the driven gear through the transmission chain. The driving motor drives the driving gear to rotate, and the driving gear drives the driven gear to rotate through the transmission chain. The driven gear drives the vacuum suction cup 122 to rotate around the central axis of the vacuum suction cup 122.

[0075] In some other embodiments, the rotation of the vacuum suction cup 122 may also be achieved by other types of rotation driving devices 13, which are not limited here.

[0076] The filling device 2 further includes an air inlet pipe 25, a pressure relief valve 26 and a pressure sensor 27. The air inlet pipe 25 is connected to the storage barrel 21 and is used to input gas into the storage barrel 21. The pressure relief valve 26 is installed on the storage barrel 21 and communicates with the inside of the storage barrel 21. The pressure sensor 27 is connected to the storage barrel 21 and is used to detect the internal pressure of the storage barrel 21. In this way, the dispensing pressure of the dispensing valve 23 can be controlled by controlling the internal pressure of the storage barrel 21, so that the dispensing speed of the dispensing valve 23 can be controlled, which helps the insulating paint flowing out of the dispensing valve 23 to cover the second surface 62 more evenly.

[0077] Preferably, when the dispensing valve 23 is used to fill the second side 62 of the battery 6, the dispensing pressure of the dispensing valve 23 is controlled to be 0.3MPa-0.5MPa, the dispensing speed of the dispensing valve 23 is controlled to be 100mm / s-300mm / s, and the dispensing distance between the dispensing valve 23 and the end face 60 of the battery 6 is controlled to be 3mm-10mm.

[0078] In the dispensing pressure range of 0.3MPa-0.5MPa, it is possible to provide a suitable driving force for the insulating paint, so that the insulating paint can smoothly fill the various tiny pores, depressions and complex structures of the second side 62 of the battery 6; for example, for the annular groove around the injection hole, this dispensing pressure range can make the insulating paint penetrate evenly and fully, avoiding the hidden danger of insulation caused by incomplete filling due to insufficient pressure, and preventing the insulating paint from overflowing to non-target areas due to excessive pressure, affecting other properties or appearance of the battery 6. Appropriate dispensing pressure helps to form a uniform and stable insulating paint coating. In this dispensing pressure range, the insulating paint can maintain a continuous and stable state when it is squeezed out of the dispensing valve 23, avoiding problems such as uneven paint droplet size and paint wire breakage, so that the thickness of the insulating paint layer formed on the second side 62 is uniform, ensuring good insulation performance and appearance flatness, which is conducive to the smooth progress of the subsequent primary curing and end face 60 spraying process.

[0079] The dispensing speed is controlled between 100mm / s-300mm / s, achieving higher production efficiency while ensuring the dispensing quality. Compared with too slow dispensing speed, the dispensing time of a single battery 6 can be greatly reduced, especially in the large-scale battery 6 production process, which can significantly improve the overall output speed of the production line and reduce production costs.

[0080] Controlling the dispensing distance between the dispensing valve 23 and the end face 60 of the battery 6 within 3mm-10mm can achieve precise dispensing positioning. This distance range can effectively reduce the problems of paint spraying angle deviation caused by too close distance or paint atomization and drifting caused by too far distance, so that the insulating paint can accurately fall on the predetermined position of the second surface 62, improve the accuracy and repeatability of dispensing, which is crucial for ensuring the consistency of the quality of battery 6 products in mass production. At the same time, the appropriate dispensing distance can not only avoid paint splashing or excessive diffusion caused by improper distance, thereby reducing the waste of insulating paint and reducing production costs; it can also reduce the possibility of paint drifting to the surrounding environment or other non-target areas, reduce pollution to the production environment, and help maintain the cleanliness and hygiene of the production site, and improve the safety and sustainability of the production environment.

[0081] The filling device 2 further includes a stirring motor 28 and a stirring rod (not shown), wherein the stirring motor 28 is mounted on the top of the storage barrel 21, and the stirring rod is disposed inside the storage barrel 21 and connected to the output end of the stirring motor 28, and the stirring motor 28 is used to drive the stirring rod to rotate around the central axis of the stirring rod, thereby ensuring that the fluidity of the insulating paint is maintained and the glue is discharged smoothly.

[0082] The filling device 2 further comprises a liquid level sensor 29 , which is installed on the storage barrel 21 and is used to detect the liquid level of the insulating varnish in the storage barrel 21 , so as to facilitate timely replenishment of the insulating varnish in the storage barrel 21 .

[0083] See also Figure 5 A one-time curing device 3 provided in an embodiment of the present invention includes a second mounting frame 31 and a pre-curing lamp 32. The pre-curing lamp 32 is connected to the second mounting frame 31 and is located above the vacuum positioning fixture 12. The lower end of the pre-curing lamp 32 is recessed upward to form a light emitting groove 321. When the conveying device 1 moves the battery 6 to the bottom of the pre-curing lamp 32, the orthographic projection of the groove wall of the light emitting groove 321 in the horizontal plane at least covers the orthographic projection of the second surface 62 of the battery 6 in the horizontal plane. That is, the orthographic projection area of ​​the light emitting groove 321 on the horizontal plane is larger than the orthographic projection area of ​​some areas of the battery 6 on the horizontal plane; in this way, when the battery 6 is placed in the primary curing station directly below the light emitting groove 321, the light emitted by the light emitting groove 321 cures the coating that has covered the second side 62 of the battery 6. The light emitting groove 321 can effectively gather the energy emitted by the curing lamp and concentrate it on the end face 60 of the battery 6. This energy-concentrated design enables the insulating paint to absorb sufficient energy more quickly, thereby significantly increasing the rate of the curing reaction and reducing the time required for primary curing. At the same time, since the light emitting groove 321 covers at least the end face 60 of the battery 6, it can ensure that each area of ​​the end face 60 of the battery 6 receives relatively uniform light energy, avoiding the problem of inconsistent curing degree of the insulating paint due to uneven light.

[0084] Specifically, in this embodiment, the insulating paint is UV insulating paint, and the pre-curing lamp 32 is an ultraviolet lamp. When the ultraviolet lamp irradiates the UV insulating paint that has covered the second surface 62 of the battery 6, the UV insulating paint is cured on the second surface 62.

[0085] See also Figure 7-Figure 8 A spraying device 4 provided in an embodiment of the present invention includes a spraying chamber 41, a second driving device 42 and a spray gun 43. The second driving device 42 is arranged in the spraying chamber 41, and the second driving device 42 is connected to the spray gun 43 and can drive the spray gun 43 to move. When the conveying device 1 transports the battery 6 to the spraying station in the spraying chamber 41, the second driving device 42 drives the spray gun 43 to move above the battery 6, and the spray gun 43 sprays the paint to the end face of the battery 6. The second driving device 42 drives the spray gun 43 in an automated movement mode, so that the spraying device 4 can be seamlessly connected with the conveying device 1 to realize the continuous automated spraying operation of the battery 6; when the battery 6 passes through the spraying chamber 41 on the conveyor belt 11 in sequence, the spray gun 43, under the control of the second driving device 42, sprays each battery 6 quickly and accurately according to a preset program, and the spraying efficiency is high.

[0086] See also Fig. 9 The secondary curing device 5 provided in the embodiment of the present invention comprises a first bracket 51, a first curing lamp 52, a second bracket 53 and a second curing lamp 54. The first bracket 51 is arranged on one side of the conveying device 1, the second bracket 53 is arranged on the side of the conveying device 1 away from the first bracket 51, the first curing lamp 52 is installed on the first bracket 51 and is arranged downwardly inclined relative to the horizontal plane, the first curing lamp 52 is located above the conveying device 1, the second curing lamp 54 is installed on the second bracket 53 and is arranged downwardly inclined relative to the horizontal plane, and the second curing lamp 54 is located above the conveying device 1. When the conveying device 1 transports the battery 6 to the secondary curing station between the first bracket 51 and the second bracket 53, the paint sprayed on the end face of the battery 6 is cured by the light emitted by the first curing lamp 52 and the second curing lamp 54. Specifically, in the present embodiment, the first curing lamp 52 and the second curing lamp 54 are ultraviolet lamps. When the ultraviolet lamps irradiate the UV insulating paint covered on the end face 60 of the battery 6, the UV insulating paint is cured on the end face 60.

[0087] The first curing lamp 52 and the second curing lamp 54 are respectively arranged from both sides of the conveying device 1 and tilted downward relative to the horizontal plane. This layout can form multi-angle light coverage for the end face 60 and the side area of ​​the battery 6. For the battery 6, its side also needs good insulation performance during use. Through the curing lamps tilted on both sides, it can ensure that the insulating paint is uniformly cured on the end face 60 and the side of the battery 6, avoiding the problem of incomplete curing caused by blind spots of light, and improving the overall insulation reliability of the battery 6. For example, in some application scenarios with high requirements for the insulation of the battery 6, such as the battery 6 group of electric vehicles, this comprehensive curing effect can effectively reduce the risk of failure of the battery 6 due to poor insulation, and ensure the safe and stable operation of the battery 6 system. The setting of the curing lamp tilted downward increases the contact area and angle diversity between the light and the surface of the battery 6. Compared with the curing lamp irradiation in a single direction, it can make the insulating paint absorb light energy more quickly and accelerate the curing reaction process.

[0088] Preferably, the inclination angle of the first curing lamp 52 relative to the horizontal plane is controlled to be 15°-75°, and the inclination angle of the first curing lamp 52 relative to the horizontal plane is controlled to be 15°-75°. The first curing lamp 52 and the second curing lamp 54 are symmetrically arranged. By controlling the inclination angle of the first curing lamp 52 and the second curing lamp 54 relative to the horizontal plane within the range of 15°-75°, a better distribution of light energy can be achieved on the battery surface; within this angle range, when the curing lamp is irradiated, the light will not be too concentrated, resulting in the problem of the insulating paint curing too fast, stress or even cracking due to excessive energy in the local area of ​​the battery, nor will it be too dispersed, resulting in low overall curing efficiency. For example, for the central area of ​​the top surface of the battery, the inclination angle within this range can make the light evenly dispersed, ensuring the smooth curing of the insulating paint; and for the transition area of ​​the edge of the top surface of the battery and the upper part of the side, the light can be incident at a suitable angle, ensuring that these shape-changing parts can also obtain sufficient energy for effective curing, thereby improving the uniformity and curing quality of the insulating paint curing on the entire battery surface.

[0089] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A spraying method for spraying a battery (6), wherein the battery (6) has an end surface (60), wherein the end surface (60) includes a first surface (61) and a second surface (62) connected to each other, wherein the height of the first surface (61) is higher than that of the second surface (62); characterized in that: The spraying method comprises the following steps: The battery (6) is in place: the battery (6) is transported to the glue dispensing station by the conveying device (1); Filling: when the battery (6) is placed at the glue dispensing station, a filling operation is performed on the second surface (62) of the battery (6) by means of a filling device (2), so that the coating covers the second surface (62) of the battery (6) to form a filling layer; Primary curing: transporting the battery (6) to a primary curing station corresponding to a primary curing device (3) via the conveying device (1), and curing the coating covering the second surface (62) of the battery (6) via the primary curing device (3); Spraying: transporting the battery (6) to a spraying station corresponding to the spraying device (4) through the conveying device (1), and spraying the end surface (60) of the battery (6) through the spraying device (4) to spray the coating onto the end surface (60) of the battery (6); Secondary curing: The battery (6) is transported to a secondary curing station corresponding to a secondary curing device (5) by the conveying device (1), and the coating sprayed on the end surface (60) of the battery (6) is cured by the secondary curing device (5).

2. The spraying method according to claim 1, characterized in that: The height of the filling layer is A, and the height difference between the first surface (61) and the second surface (62) is B, satisfying: 0.75≤A / B≤1.

3. The spraying method according to claim 1, characterized in that: The coating is insulating varnish.

4. The spraying method according to claim 1, characterized in that: The conveying device (1) comprises a conveying belt (11) and a vacuum positioning jig (12), wherein the vacuum positioning jig (12) is connected to the conveying belt (11) and is used to absorb and fix the battery (6); The filling device (2) comprises a material storage barrel (21), a discharge hose (22), a dispensing valve (23) and a first driving device (24); the material storage barrel (21) is connected and communicated with the dispensing valve (23) via the discharge hose (22); the dispensing valve (23) is used to perform a filling operation on the second surface (62) of the battery (6); and the first driving device (24) is connected to the dispensing valve (23); When the battery (6) is adsorbed and fixed on the vacuum positioning fixture (12) and transported to the dispensing station via the conveyor belt (11), the first driving device (24) drives the dispensing valve (23) to move to just above the second surface (62), and the dispensing valve (23) covers the coating on the second surface (62) of the battery (6) to form a filling layer.

5. The spraying method according to claim 4, characterized in that: The conveying device (1) further comprises a rotation driving device (13); The vacuum positioning fixture (12) comprises a first mounting frame (121) and a vacuum suction cup (122), wherein the first mounting frame (121) is connected to the conveyor belt (11), and the vacuum suction cup (122) is connected to the first mounting frame (121); the rotation driving device (13) is mounted on the first mounting frame (121), and the rotation driving device (13) and the vacuum suction cup (122) are connected; When the battery (6) is adsorbed and fixed on the vacuum suction cup (122) and the vacuum positioning fixture (12) is placed at a dispensing station, the rotary drive device (13) drives the vacuum suction cup (122) to rotate around the central axis of the vacuum suction cup (122).

6. The spraying method according to claim 4, characterized in that: The filling device (2) further comprises an air inlet pipe (25), a pressure relief valve (26) and a pressure sensor (27); the air inlet pipe (25) is connected to the material storage barrel (21) and is used to input gas into the material storage barrel (21); the pressure relief valve (26) is installed on the material storage barrel (21) and is connected to the interior of the material storage barrel (21); and the pressure sensor (27) is connected to the material storage barrel (21) and is used to detect the internal pressure of the material storage barrel (21).

7. The spraying method according to claim 6, characterized in that: When the dispensing valve (23) is used to perform a filling operation on the second surface (62) of the battery (6), the dispensing pressure of the dispensing valve (23) is controlled to be 0.3MPa-0.5MPa, the dispensing speed of the dispensing valve (23) is controlled to be 100mm / s-300mm / s, and the dispensing distance between the dispensing valve (23) and the end surface (60) of the battery (6) is controlled to be 3mm-10mm.

8. The spraying method according to claim 1, characterized in that: The primary curing device (3) comprises a second mounting frame (31) and a pre-curing lamp (32), wherein the pre-curing lamp (32) is connected to the second mounting frame (31) and is located above the conveying device (1), and the lower end of the pre-curing lamp (32) is recessed upward to form a light emitting groove (321); When the conveying device (1) transports the battery (6) to a primary curing station directly below the pre-curing lamp (32), the orthographic projection of the groove wall of the light emitting groove (321) on the horizontal plane at least covers the orthographic projection of the second surface (62) of the battery (6) on the horizontal plane in a direction from top to bottom; the light emitted by the light emitting groove (321) cures the coating that has covered the second surface (62) of the battery (6).

9. The spraying method according to claim 1, characterized in that: The spraying device (4) comprises a spraying chamber (41), a second driving device (42) and a spray gun (43), wherein the second driving device (42) is arranged in the spraying chamber (41), and the second driving device (42) is connected to the spray gun (43); When the conveying device (1) transports the battery (6) to the spraying station in the spraying room (41), the second driving device (42) drives the spray gun (43) to move above the battery (6), and the spray gun (43) sprays the coating onto the end surface (60) of the battery (6).

10. The spraying method according to claim 1, characterized in that: The secondary curing device (5) comprises a first bracket (51), a first curing light (52), a second bracket (53) and a second curing light (54); the first bracket (51) is arranged on one side of the conveying device (1); the second bracket (53) is arranged on a side of the conveying device (1) away from the first bracket (51); the first curing light (52) is mounted on the first bracket (51) and is arranged to be tilted downward relative to a horizontal plane; the first curing light (52) is located above the conveying device (1); the second curing light (54) is mounted on the second bracket (53) and is arranged to be tilted downward relative to a horizontal plane; the second curing light (54) is located above the conveying device (1); When the conveying device (1) transports the battery (6) to the secondary curing station between the first bracket (51) and the second bracket (53), the paint sprayed on the end surface (60) of the battery (6) is cured by the light emitted by the first curing lamp (52) and the second curing lamp (54).

11. The spraying method according to claim 10, characterized in that: The first curing light (52) is controlled to have an inclination angle of 15°-75° relative to the horizontal plane. The first curing light (52) is controlled to have an inclination angle of 15°-75° relative to the horizontal plane. The first curing light (52) and the second curing light (54) are symmetrically arranged.

12. The spraying method according to any one of claims 1 to 11, characterized in that: The method further comprises a visual edge-grabbing and positioning step, which is arranged after the battery (6) is in place step and before the primary curing step; in the visual edge-grabbing and positioning step, image information data of the end face (60) of the battery (6) is collected by a visual inspection device and the image information data is analyzed and identified to obtain the position data and shape and size data of the second face (62) of the battery (6).

Images