Soldering flux smearing device for solder strip

Abstract

The utility model discloses a soldering flux smearing device for a solder strip, and belongs to the technical field of photovoltaic modules. The soldering flux smearing device comprises a soldering flux groove, a soldering flux spraying device and a soldering flux spraying device, wherein a solder strip can be arranged above the liquid level of soldering flux in the soldering flux groove; the supporting plate is arranged facing the welding strip; the lifting assembly is connected with the supporting plate and used for driving the supporting plate to ascend and descend; the soldering flux boss is arranged on the face, facing the welding strip, of the supporting plate and corresponds to the position of a pressure welding point contact area on the welding strip, and the soldering flux boss can descend to be immersed in soldering flux liquid or ascend to be smeared on the pressure welding point contact area on the welding strip under driving of the supporting plate. According to the utility model, the problem of corrosion of the battery piece caused by residual soldering flux in the prior art is solved, the soldering flux can be smeared and infiltrated only in the pressure welding point contact area on the welding strip, and the redundant soldering flux is effectively prevented from being attached to the battery piece in the subsequent welding process.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic components, and in particular relates to a flux coating device for a welding strip. Background Art

[0002] Laser welding is the main welding process for photovoltaic modules. It uses the high energy density generated by the laser beam to melt the surface of the metal material to achieve welding.

[0003] Acidic flux is a commonly used flux in the laser welding process of photovoltaic modules. It can quickly remove oxides on the surface of the solder ribbon. However, the residual flux can easily cause corrosion of the solar cells, thereby affecting the electrical performance and stability of the photovoltaic module. Utility Model Content

[0004] In view of the above analysis, the present invention aims to provide a flux coating device for a soldering strip, so as to solve the problem of corrosion of the battery cell caused by residual flux in the prior art.

[0005] The purpose of this utility model is mainly achieved through the following technical solutions:

[0006] The utility model provides a flux coating device for a soldering strip, comprising: a flux tank, in which the soldering strip can be placed above the flux liquid level in the flux tank; a support plate, arranged facing the soldering strip; a lifting assembly, connected to the support plate, and used to drive the support plate to rise and fall; and a flux boss, which is arranged on a side of the support plate facing the soldering strip and corresponds to the position of the contact area of ​​the pressure welding point on the soldering strip. Driven by the support plate, the flux boss can descend and be immersed in the flux liquid or rise to coat the contact area of ​​the pressure welding point on the soldering strip.

[0007] Furthermore, the soldering ribbon is used to be soldered to the battery cell, and the number of flux bosses corresponds one-to-one to the number of pressure welding point contact areas on the soldering ribbon, and the number of pressure welding point contact areas on the soldering ribbon corresponds one-to-one to the number of pressure welding points on the battery cell.

[0008] Furthermore, the lifting assembly includes a driving cylinder and a lifting shaft, one end of the lifting shaft is fixedly connected to the output shaft of the driving cylinder, and the other end of the lifting shaft is fixedly connected to the support plate.

[0009] Furthermore, the device also includes a conveying assembly for driving the soldering ribbon to move; the conveying assembly includes a plurality of conveying rollers, and the plurality of conveying rollers are divided into two groups, and the two groups of conveying rollers are respectively arranged on both sides of the flux tank.

[0010] Furthermore, in each group of conveying rollers, two adjacent conveying rollers are respectively located on two sides of the welding strip.

[0011] Furthermore, the number of conveying rollers is four, and two conveying rollers form a group; along the movement direction of the welding strip, the group located upstream includes a first front roller and a second front roller located above the first front roller, and the group located downstream includes a first rear roller and a second rear roller located above the first rear roller; the first front roller and the first rear roller are in contact with the upper end surface of the welding strip, and the second front roller and the second rear roller are in contact with the lower end surface of the welding strip.

[0012] Furthermore, along the movement direction of the welding strip, the first front roller, the second front roller, the first rear roller and the second rear roller divide the welding strip into a first straight section, a first vertical section, a second straight section, a second vertical section and a third straight section which are connected in sequence.

[0013] Furthermore, there are multiple flux bosses, and the multiple flux bosses are arranged in a matrix; and / or the flux bosses and the support plate are integrally formed parts; and / or the cross-section of the bosses is circular, rectangular, upright, diamond-shaped or triangular.

[0014] Furthermore, the height of the flux boss is 5 to 20 mm.

[0015] Furthermore, the flux boss is an elastic boss.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] The flux coating device for the welding strip provided by the utility model has a simple structure and is easy to operate. By improving the way the flux infiltrates the welding strip, a flux boss corresponding to the position of the contact area of ​​the pressure welding point is set, and the supporting plate and the flux boss are driven to rise and fall as a whole by the lifting component, so that the flux boss can be lowered and immersed in the flux liquid or raised to coat the contact area of ​​the pressure welding point on the welding strip under the drive of the supporting plate, and only the contact area of ​​the pressure welding point on the welding strip is coated and infiltrated with flux, which can effectively avoid excess flux adhering to the battery cell in the subsequent welding process, and further avoid the corrosion of the battery cell by the flux, thereby ensuring the welding effect and the reliability of the battery cell, realizing rapid welding of photovoltaic cells, and improving the production efficiency of photovoltaic cells.

[0018] Other features and advantages of the present invention will be described in the following description, and some will become apparent from the description or be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are only used to illustrate the specific purpose of the present invention and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0020] Figure 1 This is a schematic structural diagram of a flux coating device for a soldering ribbon provided in the first embodiment of the present invention, wherein the flux boss is in an immersed state;

[0021] Figure 2 This is a schematic structural diagram of a flux coating device for a soldering ribbon provided in the first embodiment of the present invention, wherein the flux boss is in a coating state;

[0022] Figure 3 This is a schematic diagram of the connection between the lifting assembly, the support plate and the flux boss in the flux coating device for solder strips provided in the first embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the arrangement of flux bosses in a flux coating device for a soldering ribbon provided in the first embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the positions of the conveying component and the soldering ribbon in the flux coating device for the soldering ribbon provided in Example 1 of the present invention.

[0025] Reference numerals:

[0026] 1- flux tank; 2- solder strip; 201- first straight section; 202- first vertical section; 203- second straight section; 204- second vertical section; 205- third straight section; 3- flux boss; 4- support plate; 5- driving cylinder; 6- lifting shaft; 7- first front roller; 8- second front roller; 9- first rear roller; 10- second rear roller. DETAILED DESCRIPTION

[0027] The preferred embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the accompanying drawings to illustrate the principles of the present invention.

[0028] Example 1

[0029] This embodiment provides a flux coating device for a soldering ribbon, see Figures 1 to 4 ,include:

[0030] The flux tank 1, the soldering ribbon 2 can be placed above the flux liquid level in the flux tank 1;

[0031] A support plate 4 (for example, a stainless steel support plate or a hard silicone support plate) is provided facing the welding strip 2;

[0032] A lifting assembly connected to the support plate 4 and used to drive the support plate 4 to move up and down; and

[0033] The flux boss 3 is arranged on the side of the support plate 4 facing the soldering strip 2, and corresponds to the position of the soldering point contact area on the soldering strip 2 (for example, a tin-lead soldering strip). Driven by the support plate 4, the flux boss 3 can descend and be immersed in the flux liquid (that is, in an immersed state) or rise to coat the soldering point contact area on the soldering strip 2 (that is, in a coating state).

[0034] It should be noted that in the subsequent welding process between the soldering ribbon 2 and the battery cell, the contact area of ​​the pressure welding point on the soldering ribbon 2 corresponds to the position of the pressure welding point (i.e., the PAD point) on the battery cell, and the pressure welding point contact area is welded and fixed to the pressure welding point. Accordingly, the number of flux bosses 3 corresponds one-to-one to the number of pressure welding point contact areas on the soldering ribbon 2, and the number of pressure welding point contact areas on the soldering ribbon 2 corresponds one-to-one to the number of pressure welding points on the battery cell.

[0035] As for the structure of the lifting assembly, specifically, it includes a driving cylinder 5 and a lifting shaft 6, one end of the lifting shaft 6 is fixedly connected to the output shaft of the driving cylinder 5, and the other end of the lifting shaft 6 is fixedly connected to the support plate 4.

[0036] During implementation, at the beginning of the work, the flux boss 3 is in an immersed state, the flux boss 3 and the support plate 4 are immersed in the flux in the flux tank 1, and the side of the flux boss 3 facing the soldering point is stained with flux, see Figure 1 ; The soldering ribbon 2 is moved to above the flux liquid level in the flux tank 1 and then stopped, and the soldering ribbon 2 remains stationary; the lifting assembly is turned on, and the lifting assembly drives the flux boss 3 and the support plate 4 to rise as a whole, so that the flux boss 3 switches from the immersion state to the coating state, and the flux on the side of the flux boss 3 facing the bonding point contacts the bonding point contact area, and the flux is directly coated on the bonding point contact area, see Figure 2 ; The lifting assembly drives the flux boss 3 and the support plate 4 to descend as a whole, and the flux boss 3 and the support plate 4 are re-immersed in the flux in the flux tank 1, and the flux boss 3 switches from the smearing state to the immersed state; the soldering ribbon 2 moves away from the transfer liquid surface of the flux tank 1, and is placed above the battery cell after cutting. At this time, the contact area of ​​the pressure welding point coated with flux under the soldering ribbon 2 contacts the pressure welding point of the battery cell. After the soldering ribbon 2 is fixed, laser welding is performed to complete the preparation of the battery string.

[0037] Compared with the prior art, the flux coating device for the welding strip provided in this embodiment has a simple structure and is easy to operate. By improving the way in which the flux infiltrates the welding strip 2, a flux boss 3 corresponding to the position of the contact area of ​​the pressure welding point is set, and the support plate 4 and the flux boss 3 are driven to rise and fall as a whole by the lifting component, so that the flux boss 3 can be lowered and immersed in the flux liquid or raised to coat the contact area of ​​the pressure welding point on the welding strip 2 under the drive of the support plate 4. Only the contact area of ​​the pressure welding point on the welding strip 2 is coated and infiltrated with flux, which can effectively avoid excess flux adhering to the battery cell during the subsequent welding process, and thus can avoid the corrosion of the battery cell by the flux, thereby ensuring the welding effect and the reliability of the battery cell, realizing rapid welding of photovoltaic cells, and improving the production efficiency of photovoltaic cells.

[0038] Exemplarily, there are multiple flux bosses 3 , and the multiple flux bosses 3 are arranged in a matrix, that is, the flux bosses 3 are arranged in multiple rows and columns.

[0039] Specifically, see Figure 4 The number of flux bosses 3 is 30, which are arranged in a 5×6 manner.

[0040] From the perspective of structural stability, the flux boss 3 and the support plate 4 are formed as an integral part.

[0041] For example, the cross-sectional shape of the flux boss 3 can be circular, rectangular, square, diamond or triangular, etc. In practical applications, it can be selected according to needs, and will not be described in detail here.

[0042] In order to realize the transmission of the soldering ribbon 2, the above-mentioned flux coating device for the soldering ribbon also includes a transmission component for driving the soldering ribbon 2 to move. The soldering ribbon 2 is driven to move by the transmission component so that the soldering ribbon 2 is placed above the flux liquid level in the flux tank 1 or above the flux liquid level leaving the flux tank 1.

[0043] Specifically, the conveyor assembly includes multiple conveyor rollers, which are divided into two groups. The two groups of conveyor rollers are respectively arranged on either side of the flux tank 1. In other words, one group of conveyor rollers is located on one side of the flux tank 1, and the other group of conveyor rollers is located on the other side of the flux tank 1. In each group of conveyor rollers, two adjacent conveyor rollers are respectively located on either side of the soldering ribbon 2. In this way, during the conveying process, the two groups of conveyor rollers can appropriately stretch the soldering ribbon 2 to ensure that the soldering ribbon 2 is straight during the conveying process.

[0044] Exemplarily, the number of the above-mentioned conveying rollers is four, and two conveying rollers form a group. Along the moving direction of the welding ribbon 2, the group located in the front includes the first front roller 7 and the second front roller 8 located above the first front roller 7, and the group located in the rear includes the first rear roller 9 and the second rear roller 10 located above the first rear roller 9. The first front roller 7 and the first rear roller 9 are in contact with the upper end surface of the welding ribbon 2, and the second front roller 8 and the second rear roller 10 are in contact with the lower end surface of the welding ribbon 2. In this way, along the moving direction of the welding ribbon 2, the first front roller 7, the second front roller 8, the first rear roller 9 and the second rear roller 10 divide the welding ribbon 2 into a first straight section 201, a first vertical section 202, a second straight section 203, a second vertical section 204 and a third straight section 205 connected in sequence, see Figure 5 , so that the soldering ribbon 2 can be kept straight during the transmission process, ensuring the accuracy of flux application.

[0045] In order to avoid contact between the soldering ribbon 2 and the gap between the flux boss 3, resulting in excess flux residue, the height of the flux boss 3 is 5 to 20 mm, for example, it can be 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 17 mm or 20 mm, etc. In this way, the height of the flux boss 3 is guaranteed, even if the soldering ribbon 2 is not completely stretched and flattened, it can still be ensured that the soldering ribbon 2 will not contact the gap between the flux boss 3.

[0046] To ensure sufficient application of the soldering flux, the soldering flux boss 3 is an elastic boss, for example, made of soft silicone. Thus, after the soldering flux on the side of the soldering flux boss 3 facing the soldering pad contacts the soldering pad contact area, the soldering flux boss 3 can be further driven upward for a certain distance, causing the elastic boss 3 to undergo a certain elastic deformation, allowing the soldering flux to closely contact the soldering pad contact area, thereby ensuring sufficient application of the soldering flux.

[0047] In order to prevent the flux tank 1 from reacting with the flux contained therein, the flux tank 1 is a stainless steel flux tank.

[0048] Exemplarily, the flux in the flux tank 1 is an organic low-activity flux, including an organic solvent, rosin resin and its derivatives, an activator, an anti-corrosion agent, a co-solvent and a film-forming agent, wherein the activator includes a synthetic resin surfactant and an organic acid activator.

[0049] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A flux coating device for a soldering ribbon, characterized in that: include: a flux tank, wherein the soldering ribbon can be placed above the flux liquid level in the flux tank; A support plate, arranged facing the welding strip; A lifting assembly connected to the support plate, used to drive the support plate to move up and down; as well as The flux boss is arranged on the side of the support plate facing the solder strip and corresponds to the position of the soldering point contact area on the solder strip. Driven by the support plate, the flux boss can descend and immerse in the flux liquid or rise to coat the soldering point contact area on the solder strip.

2. The flux coating device for soldering strips according to claim 1, characterized in that: The soldering ribbon is used to be soldered to the battery cell, the number of the flux bosses corresponds one-to-one to the number of the pressure welding point contact areas on the soldering ribbon, and the number of the pressure welding point contact areas on the soldering ribbon corresponds one-to-one to the number of the pressure welding points on the battery cell.

3. The flux coating device for soldering strips according to claim 1, characterized in that: The lifting assembly includes a driving cylinder and a lifting shaft, one end of the lifting shaft is fixedly connected to the output shaft of the driving cylinder, and the other end of the lifting shaft is fixedly connected to the support plate.

4. The flux coating device for soldering strips according to claim 1, characterized in that: The device also includes a conveying assembly for driving the welding ribbon to move; The conveying assembly includes a plurality of conveying rollers, which are divided into two groups. The two groups of conveying rollers are respectively arranged on two sides of the flux tank opposite to each other.

5. The flux coating device for soldering strips according to claim 4, characterized in that: In each group of conveying rollers, two adjacent conveying rollers are respectively located on two sides of the welding strip.

6. The flux coating device for soldering strips according to claim 5, characterized in that: There are four conveying rollers, two of which form a group; Along the moving direction of the welding strip, the upstream group includes a first front roller and a second front roller located above the first front roller, and the downstream group includes a first rear roller and a second rear roller located above the first rear roller; The first front roller and the first rear roller are in contact with the upper end surface of the welding strip, and the second front roller and the second rear roller are in contact with the lower end surface of the welding strip.

7. The flux coating device for soldering strips according to claim 6, characterized in that: Along the moving direction of the welding strip, the first front roller, the second front roller, the first rear roller and the second rear roller divide the welding strip into a first straight section, a first vertical section, a second straight section, a second vertical section and a third straight section which are connected in sequence.

8. The flux coating device for soldering strips according to any one of claims 1 to 7, characterized in that: There are multiple soldering flux bosses, and the multiple soldering flux bosses are arranged in a matrix; and / or The flux boss and the support plate are an integrally formed part; and / or The cross section of the boss is circular, rectangular, upright, diamond or triangular.

9. The flux coating device for soldering strips according to any one of claims 1 to 7, characterized in that: The height of the flux boss is 5 to 20 mm.

10. The flux coating device for soldering strips according to any one of claims 1 to 7, characterized in that: The soldering flux boss is an elastic boss.

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