CN219403044U - Solar cell string welding tool - Google Patents

Abstract

The utility model discloses a solar battery series welding tool, which comprises a casing, a heating source arranged on the casing, and a pressing pin, wherein a through hole is arranged at the bottom of the casing, and the top of the pressing pin is connected with the heating source through the through hole, and the heating source is used to heat the pressing pin. By setting a through hole in the shell to install the pressing pin, and setting the heating source to heat the pressing pin, it solves the problem of narrow process window when welding temperature-sensitive batteries in the traditional welding method of upper infrared heating and lower heating plate heating.

Description

A solar cell string welding tool

technical field

The utility model relates to the technical field of photovoltaic component manufacturing, in particular to a solar battery string welding tool.

Background technique

During the use of photovoltaic modules, the battery sheets need to be welded to form a battery string, and then connected to the junction box to form a module.

Existing crystalline silicon solar cells usually use upper infrared heating and lower heating plate to weld battery strings. During welding, a presser is needed to fix the ribbon to prevent the ribbon from rolling and ensure that the ribbon and the solder joints are in contact with each other.

However, when the pressure tool is pressed on the ribbon, the pressure tool will block the infrared light, causing the temperature at the solder joint to be lower than that of other unshielded places. For temperature-sensitive solar cells, the temperature of the non-welding area may exceed the tolerance temperature, while the temperature of the solder joint has not yet reached the welding temperature.

Therefore, it is necessary to develop a new type of welding method to avoid the problem of narrow process window of the existing welding method.

Utility model content

The purpose of the utility model is to provide a solar battery string welding tool, which solves the problem of narrow process window of the existing welding method, improves welding quality and welding efficiency, and reduces component cost.

In order to solve the above-mentioned technical problems, the embodiment of the present utility model provides a solar cell string welding tool, which includes a housing, a heating source disposed on the housing, and a pressing pin, wherein a through hole is provided at the bottom of the housing, and the top of the pressing pin is connected to the heating source through the through hole, and the heating source is used to heat the pressing pin.

Wherein, it also includes a groove arranged at the bottom of the pressing pin for fixing the welding ribbon.

Wherein, the shape of the groove is triangular, rectangular, U-shaped or trapezoidal

Wherein, the heating source is a heating or cooling medium or a heating sleeve provided in the housing through an injection port provided in the housing, the heating or cooling medium conducts heat through contact with the indenter, the heating sleeve is arranged on the top of the indenter, and the indenter is heated by an internal heating wire.

Wherein, it also includes a sealing ring arranged in the through hole for sealing the housing and the pressing needle.

Wherein, the through hole and the injection port are the same opening or different openings

Wherein, it also includes a spring arranged between the shell and the pressing needle.

Wherein, the indenter is an I-shaped indenter, the spring is arranged between the top lower end and the bottom upper end of the indenter, and the spring is arranged inside or outside the casing.

Wherein, the shell is a metal shell or a ceramic shell.

Wherein, the indenter is a copper indenter, an iron indenter or an alloy indenter.

Wherein, it also includes a height limiting structure arranged on the inner and outer periphery of the outer shell.

Compared with the prior art, the solar battery string welding tool provided by the embodiment of the utility model has the following advantages:

The solar battery string welding tool is provided with through holes in the shell to install press pins, and the heat source is set to heat the press pins, which solves the problem of narrow process window when welding temperature-sensitive batteries in the traditional welding method of upper infrared heating and lower heating plate heating, endows the welding press with a heating function, concentrates the heating on the position of the solder joint, and reduces the difficulty of welding by setting the press pins.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the utility model. For those of ordinary skill in the art, other accompanying drawings can also be obtained according to these drawings without paying creative work.

Fig. 1 is a structural schematic diagram of an embodiment of a solar cell string welding tool provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the welding structure of an embodiment of the solar cell string welding tool provided by the embodiment of the present invention;

Fig. 3 is a schematic bottom view of an embodiment of the solar cell string welding tool provided by the embodiment of the present invention;

Fig. 4 is a schematic structural view of the electric heating press pin of the solar battery string welding tool provided by the embodiment of the present invention;

Among them, 11-housing, 12-heating or cooling medium, 13-pressure needle, 14-sealing ring, 15-spring, 16-pressure needle groove, 17-height limit structure, 31-welding strip, 32-battery sheet, 33-heating plate, 41-heating sleeve, 42-electrode lead wire.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figures 1-4, Figure 1 is a schematic structural diagram of an embodiment of the solar cell string welding tool provided by the embodiment of the present invention; Figure 2 is a schematic structural view of the welding structure of an embodiment of the solar cell string welding tool provided by the embodiment of the present utility model;

In a specific embodiment, the solar cell string welding tool includes a housing 11, a heating source disposed on the housing 11, and a pressing pin 13, wherein a through hole is provided at the bottom of the housing 11, and the top of the pressing pin 13 is connected to the heating source through the through hole, and the heating source is used to heat the pressing pin 13.

By setting through-holes on the casing 11 to install the indenter 13, and by setting the heating source to heat the indenter 13, the problem of a narrow process window when welding temperature-sensitive batteries in the traditional welding method of upper infrared heating and lower heating plate 33 is solved, and the welding presser is endowed with a heating function, and the heating is concentrated on the position of the solder point. By setting the indenter 13, the difficulty of welding is reduced.

The present application adopts a local heating method, that is, a heating source is used to pressurize the pressing pin 13 so as to fix the welding ribbon 31 , and the structure and installation method of the heating source are not limited.

In this application, the medium voltage is aimed at fixing the ribbon, but in actual operation, there may be sliding, which may lead to unstable fixing, resulting in a decrease in welding accuracy and efficiency. In order to solve this technical problem, in one embodiment, the solar cell string welding tool also includes a groove 16 for fixing the ribbon 31 at the bottom of the pressure pin 13 .

The welding ribbon 31 can be fixed through the groove, so that the welding ribbon will not move during the welding process, which improves the welding efficiency and welding quality.

The present application does not limit the shape of the groove, which is triangular, rectangular, U-shaped, or trapezoidal, or other present conditions.

In this application, heating is performed by a heating source, and the heating method and structure of the heating source are not limited. In one embodiment, the heating source is a heating or cooling medium 12 or a heating sleeve 41 disposed in the housing 11 through an injection port of the housing 11. The heating or cooling medium 12 conducts heat by contacting the indenter 13. The heating sleeve 41 is arranged on the top of the indenter 13, and the indenter 13 is heated by an internal heating wire.

In one embodiment, the heating source adopts electric heating, and the heating sleeve 41 is in contact with the pressing pin 13 , and the electrode lead wire 42 is connected with the heating sleeve 41 and then energized for heating.

The heating source can also be of other structures.

In the above structure, the heating or cooling medium 12 can be set, the heating or cooling medium 12 can be heated, and then the indenter 13 can be heat-conducted, and the heating wire of the heating sleeve 41 can also be energized for heating to realize the heating of the indenter 13.

In this application, the temperature control of the indenter 13 can be realized by controlling the temperature sensor and power control.

Since the heating or cooling medium 12 may be used in this application, unloading leakage is easy to occur, and subsequent maintenance is also inconvenient.

In order to solve this technical problem, in one embodiment, the solar cell string welding tool further includes a sealing ring 14 disposed in the through hole for sealing the casing 11 and the pressing pin 13 .

Through the setting of the sealing ring 14, the outflow of liquid is avoided and the replacement of the pressing needle 13 is facilitated, thereby improving the convenience of use.

The present application does not limit the size and material of the sealing ring 14 , generally a rubber sealing ring 14 is sufficient.

In this application, the pressing needle is fixed through the through hole, and the heating or cooling medium 12 is injected through the injection port. The size and position of the two are not limited in this application. The through hole and the injection port are the same opening or different openings.

That is, two different functions can be realized through the same opening, and different openings can also be set at different positions. In this application, the staff can choose the appropriate number and position according to the needs. If the same opening is used to achieve different functions, the amount of opening processing can be reduced. Using multiple openings can make the injection of the medium and the installation of the indenter not interfere with each other, reducing the difficulty of the process.

In order to avoid battery slices 32 being damaged due to collision impact during the contact process of the battery slices 32 , in one embodiment, the solar cell string welding tool further includes a spring 15 arranged between the casing 11 and the pressing pin 13 .

By setting the spring 15, the soft contact between the pressing pin 13 and the battery piece 32 is realized. After a collision, the spring 15 is compressed to reduce the impact force and damage to the battery piece 32.

In this application, there is no limitation on the installation position and size of the spring 15 .

The present application does not limit the shape and size of the indenter 13. In one embodiment, the indenter 13 is an I-shaped indenter 13, the spring 15 is arranged between the top lower end and the bottom upper end of the indenter 13, and the spring 15 is arranged inside the housing 11 or outside the housing 11.

The staff can select a suitable spring 15 setting method as required.

The shell 11 in this application is used as the carrier of other components, and its size and material are not limited. The shell 11 is a metal shell 11 or a ceramic shell 11. The thermal conductivity and heat dissipation coefficient of the shell 11 should be as low as possible to reduce heat loss.

The present application does not limit the type of heating or cooling medium 12. The specific heat capacity of the heat transfer liquid should be as high as possible to avoid excessive temperature drop. Generally, the heating or cooling medium 12 is aromatic hydrocarbon heat transfer oil or heat transfer liquid containing nano-carbon spheres.

The present application does not limit the material of the indenter 13. The heat is transferred to the welding ribbon 31 through the indenter 13. The indenter 13 is a copper indenter 13, an iron indenter 13 or an alloy indenter 13. The indenter 13 is made of metals such as copper and iron and their alloys to obtain a higher thermal conductivity.

Furthermore, in order to prevent the solar battery string welding equipment from dropping too much and causing damage to the battery sheets 32 , in one embodiment, the solar battery string welding equipment further includes a height limiting structure 17 arranged on the inner and outer circumferences of the casing 11 .

By setting the height-limiting structure 17, it is possible to control the maximum range of the pressing needle 13, avoid damage caused by excessive size, and use the height-limiting structure 17 to control the pressure during welding.

This application does not limit the installation method, material and size of the height-limiting structure 17, which can be arranged on all four sides, or only on a pair of sides.

The use process of the component welding tooling of the present application in one embodiment is as follows:

Step 1: Preheat the tooling so that the temperature of the tooling reaches the same temperature as the heating medium

Step 2: Inject the heating medium at the temperature required for welding into the inside of the tooling;

Step 3: Lay the welding ribbon 31 on the front and back of the battery sheet 32, and place it on the heating platform. The heating platform has a certain initial temperature

Step 4: Place the heating tool above the battery sheet 32 so that the groove 16 of the pressing pin 13 corresponds to the position of the welding ribbon 31;

Step 5: Raise the temperature of the heating platform to reach the temperature required for welding, and keep the temperature for a period of time to melt the solder on the surface of the solder strip 31 or solidify the conductive adhesive;

Step 6: Fill the cooling gas into the tooling and empty the heating medium, and reduce the temperature of the heating platform to realize the electrical connection between the welding strip 31 and the battery sheet 32

Step 7: Go back to Step 1.

Repeat the above steps until the battery string welding is completed.

In another embodiment, the operation flow is as follows:

Step 1: Preheat the tooling so that the temperature of the tooling reaches the welding temperature;

Step 2: power on and heat the pressure pin 13 to the welding temperature;

Step 3: Lay the welding ribbon 31 on the front and back of the battery sheet 32, and place it on the heating platform, and the heating platform has a certain initial temperature;

Step 4: Place the heating tool above the battery sheet 32 so that the groove 16 of the pressing pin 13 corresponds to the position of the welding ribbon 31;

Step 5: Raise the temperature of the heating platform to reach the temperature required for welding, and keep the temperature for a period of time to melt the solder on the surface of the solder strip 31 or solidify the conductive adhesive;

Step 6: stop heating the pressing pin 13, fill the cooling gas into the tooling to cool down the pressing pin 13, and lower the temperature of the heating platform, so as to realize the electrical connection between the welding ribbon 31 and the battery sheet 32;

Step 7: Return to Step 1;

Repeat the above steps until the battery string welding is completed.

To sum up, the solar cell string welding tool provided by the embodiment of the present application, by installing through-holes on the casing to install pressing pins, and setting a heating source to heat the pressing pins, solves the problem of narrow process window when welding temperature-sensitive batteries in the traditional welding method of upper infrared heating and lower heating plate heating, endows the welding press with a heating function, concentrates the heating on the position of the solder joint, and reduces the difficulty of welding by setting the pressing pins and using the grooves provided at the bottom of the pressing pins to fix the welding ribbon.

The solar battery string welding tool provided by the utility model has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present utility model. It should be pointed out that for those skilled in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

Claims (10)

1. The solar cell string welding tool is characterized by comprising a shell, a heating source and a pressing needle, wherein the heating source is arranged in the shell, the shell is provided with a through hole for installing the pressing needle, the top of the pressing needle is contacted with the heating source through the through hole, and the heating source is used for heating the pressing needle.

2. The solar cell string welding tool of claim 1, further comprising a groove provided at the bottom of the press pin for fixing a solder strip.

3. The solar cell string welding tool of claim 2, wherein the groove is triangular, rectangular, U-shaped or trapezoidal in shape.

4. The solar cell string welding tool according to claim 3, wherein the heating source is a heating or cooling medium or a heating jacket arranged in the shell through an injection port arranged in the shell, the heating or cooling medium conducts heat through contact with the pressing needle, the heating jacket is arranged at the top of the pressing needle, and the pressing needle is heated through an internal heating wire.

5. The solar cell string welding tool of claim 4, further comprising a sealing ring disposed in the through hole for sealing the housing from the press pin.

6. The solar cell string welding tool of claim 5, wherein the through hole and the injection port are the same opening or different openings.

7. The solar cell string welding tool of claim 6, further comprising a spring disposed between the housing and the press pin.

8. The solar cell string welding tool according to claim 7, wherein the pressing needle is an i-shaped pressing needle, the pressing needle is a copper pressing needle, an iron pressing needle or an alloy pressing needle, the spring is arranged between the top lower end and the bottom upper end of the pressing needle, and the spring is arranged in the shell or outside the shell.

9. The solar cell string welding tool of claim 8, wherein the housing is a metal housing or a ceramic housing.

10. The solar cell string welding tool of claim 9, further comprising a height limiting structure disposed at an inner periphery and an outer periphery of the housing.