JP2002211498A - Method of bonding solar battery panel, and solar battery panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce bubbles remaining in an adhesive layer, and secure a specified thickness of adhesive in bonding a solar battery for an artificial satellite. SOLUTION: Adhesive is applied by instillation at 6-points, for example, in a dispenser method, and a pressurization weight is used through a cushion to bond the solar battery. Existence of bubbles in the adhesive layer is thus restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solar cell panel mounted on, for example, an artificial satellite.

[0002]

2. Description of the Related Art FIG. 8 is a diagram showing a structure of a solar cell.
1 is a solar cell, 2 is an adhesive, and 3 is a honeycomb panel. The solar cell 1 is a very thin one having a thickness of about 0.1 to 0.5 mm, and is a plate having a size of about 20 to 110 mm square. In the solar cell 1, an outer shell constituting a part of the solar cell panel is adhered to an upper surface of a honeycomb panel 3 made of CFRP aluminum using an adhesive 2.

FIG. 9 is a view showing a mode of mounting a solar cell on a honeycomb panel. Reference numerals 1 and 3 are the same as those shown in FIG.
The solar cell 1 is adhered to the upper surface of a honeycomb panel 3 constituting a part of the solar cell panel, and is manufactured with an interval between adjacent solar cells 1 of 0.1 mm to 1 mm.

FIG. 10 is a view showing the structure of a conventional metal mask, wherein 4 is a metal mask, 5 is an opening, and 6 is a frame. The solar cell 1 is placed on the honeycomb panel 3 by 1 to 0.1 mm.
They are arranged in tiles (several to several thousand depending on the satellite scale) at approximately intervals. Also, as the adhesive 2, for example, a silicon-based adhesive or the like is used, and the solar cell 1 is adhered with an adhesive layer thickness of about 0.05 to 0.5 mm.

[0005] There is a metal mask 4 for applying an adhesive at a constant thickness, and etching or laser processing is performed on a stainless steel plate having a thickness equivalent to the target thickness of the adhesive layer of the adhesive 2. Then, the periphery of the metal mask in which the opening 5 is formed is formed by being surrounded by a frame 6. Using this metal mask, an adhesive is applied with a squeegee to obtain an adhesive applied thickness equivalent to the thickness of the mask.

At this time, the thickness of the adhesive layer is required to maintain the adhesive strength and to make the adhesive area constant for heat dissipation.
Furthermore, in order to prevent the performance of the solar cell from deteriorating, the adhesive must not adhere to the surface of the solar cell. Also, the protrusion of the adhesive to the connector must not be on the stress relief.

FIG. 11 is a view showing the structure of a conventional metal mask, in which 7 is a coating table, 8 is a projection of an adhesive, 1 and 2 are the same as those in FIG. Are the same. An adhesive is applied to the mask opening 5 of the solar cell 1 placed on the application table 7 with a squeegee. Next, in the step of removing the metal mask, a projection of the adhesive is generated along the outer shape of the mask opening 5.

[0008] This solar cell is made of, for example, a film, CFR.
In the case of sticking to a P board, a CFRP honeycomb panel, or the like, a conventional bonding method is described below.

FIG. 12 is a view showing a state in which a solar cell is attached to a panel by a conventional metal mask bonding method, where 9 is a bubble and 1 to 3 are the same as those in FIG.
At the time of bonding, the protruding portion comes into contact with the surface of the solar cell panel first, thereby trapping the bubbles 9. Even after pressurization, there is no place for bubbles to escape, so relatively large bubbles (5 mm or more) are generated.

[0010]

In the step of applying a squeegee to a solar cell and applying a squeegee to the mask opening to remove the metal mask, the solar cell is shaped according to the outer shape of the mask opening.
The protrusions of the adhesive first contact the solar cell panel surface and confine the air bubbles. Since there is no escape for the air bubbles even after the pressing, relatively large air bubbles (5 mm or more) are generated, and the bonding area is reduced. This has led to a decrease in heat dissipation due to the decrease and damage to the solar cell due to expansion of bubbles in a vacuum.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to adhere a solar cell or the like mounted on an artificial satellite, to suppress the incorporation of air bubbles, suppress the protrusion of the adhesive, and furthermore, An object of the present invention is to secure an adhesive thickness and obtain stable adhesiveness to an adherend such as a solar cell panel of an artificial satellite.

[0012]

According to a first aspect of the present invention, there is provided a method of manufacturing a solar cell panel by bonding a plurality of solar cells to a honeycomb panel, wherein an adhesive is provided on a surface of the plurality of solar cells. A first step of applying the adhesive with a dispenser, a second step of inverting the surface of the solar cell panel to which the adhesive has been applied in the first step and arranging it on the honeycomb panel, In the process, a third pressure is applied from above with the back surface of the solar cell panel disposed on the upper surface of the honeycomb panel using a pressure weight via a cushion.
And a step of:

In the bonding method according to a second aspect of the present invention, the application section according to claim 2 includes an application section A including two points at the center of the solar cell and an application section B including four points at the periphery of the solar cell. A solar cell panel characterized by comprising:

According to a third aspect of the present invention, in the third aspect, the center coordinates of the coating section are such that the Y coordinate of the coating section A is on the center line of the bonding area of the solar cell, and the X coordinate is the center line of the bonding area. Are applied, and the application portion B is bonded to a solar cell panel characterized in that the bonding area of the solar cell is reduced to the center of a quadrangular square.

In the bonding method according to a fourth aspect of the present invention, the amount of the adhesive applied to the application portion A is larger than the amount of the adhesive applied to the application portion B in the amount of the adhesive applied per one point of the application portion. A method for bonding a solar cell panel, characterized in that:

According to a fifth aspect of the present invention, there is provided a bonding method comprising:
A method for bonding solar cells, wherein the viscosity of an adhesive used for applying the dispenser according to claim 5 is 26000 CPS or less.

A bonding method according to a sixth aspect of the present invention is a method for bonding solar cell panels, wherein the pressing is performed independently for each solar cell.

A solar cell panel according to a seventh aspect of the present invention is a solar cell panel manufactured by the above-described method for bonding a solar cell panel.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing an application pattern of a solar cell by dispenser application according to Embodiment 1 of the present invention.
Reference numeral 1 denotes a coating section B, and 1 is the same as that in FIG. Figure 1
(A) is a hatched view of the application, and FIG. 1 (b) is a cross-sectional view.

In a method of manufacturing a solar cell panel by bonding a plurality of solar cells 1 to a honeycomb panel 3, a central portion is coated on the surface of the plurality of solar cells, and adhesives at four corners are coated on the surfaces of the plurality of solar cells. A step of applying the adhesive of B11, a step of inverting the surface of the solar cell panel to which the adhesive has been applied in the above step and disposing it on the honeycomb panel 3, and a step of disposing the solar cell panel on the upper surface of the honeycomb panel 3 in the above step Pressure is applied from above with the back surface of the installed solar cell panel facing upward.

The application pattern by the dispenser application is as follows. When the application amount is indicated by 6 points, the applied amount of the central portion is 10 mg and the adhesive at the four corners has less applied portion than the central portion. Coating part B
For 11, 20 mg is dripped at four points, and 220 mg is applied per solar cell.

In FIG. 1, the length of the external dimensions is 36 mm.
The schematic dimensional relationship in the example of the solar cell 1 of (X direction) and 69 mm (Y direction) is illustrated. The center line of the solar cell 1 in the Y direction is on the Y coordinate of the coating portion A10, and the center line of the solar cell 1 in the X direction is on the X coordinate which is the center line of the bonding area in the X direction. The application part A10 is bonded at two points around the center of the solar cell 1 in the X direction and two target points from the center in the Y direction, and the application part B11 is a quadrangular square in which the bonding area of the solar cell is reduced. The solar cell 1 is adhered at four points centered on.

In this bonding method, the amount of the adhesive applied to the application section A is equal to or less than the amount of the adhesive applied to the application section B.
May be applied more than the amount of the adhesive applied.

The viscosity of the adhesive used for applying the above dispenser may be 26000 CPS or less.

FIG. 2 is a view showing the supply of the adhesive to the solar cell by a dispenser, 12 is a syringe,
1 and 2 are the same as those in FIG. 1100 solar cells
By arranging about 2 mm × 200 mm, the adhesive 2 is injected into the syringe 12 and applied, so that the adhesive is bonded to the solar cell panel for each solar cell as shown in the application pattern of FIG.

FIG. 3 is a view for explaining how the adhesive spreads after the application of the adhesive, wherein 1 is the same as FIG. 8, and 10 and 11 are the same as FIG. The height of the application portion A10 and the application portion B11 applied on the solar cell 1 is such that the adhesive has a mountain-like height immediately after the application, but the height of the adhesive mountain increases from one minute to 30 minutes in the air. And the adhesive spreads to the periphery.

Then, the solar cell coated with the adhesive is turned over so that the bonding surface is on the lower side. Next, the solar cell is moved to the bonding position of the honeycomb panel 3 as an object to be bonded,
Place on a predetermined bonding position. FIG. 4 is an enlarged view of the state at this time.
Shown in

FIG. 4 is a diagram for explaining a method of pressing a solar cell on a honeycomb panel with a sponge weight.
3 is a weight with sponge, and 1 and 3 are the same as those in FIG.

A weight 13 with a sponge is placed on a plurality of solar cells 1 arranged on the honeycomb panel 3 and pressurized at a predetermined pressure. At this time, the pressure weight has a structure in which one weight is placed on one solar cell so that the influence of the force from the adjacent solar cell 1 is small, and the spread of the adhesive is different. Shall not occur.

FIG. 5 is a view for explaining a solar cell bonding step according to Embodiment 1 of the present invention. First, in step S1, the solar cell 1 sets the solar cell panel on the application table in step S1. Next, as shown in FIG. 2, in step S2, an adhesive is dropped on the solar cell by a dispenser. Then, using a rotating jig or the like, the solar cell panel is inverted in step S3. Further, as shown in FIG. 4, in step S4, a solar cell is attached to a solar cell attaching position on the honeycomb panel. Finally, in step S5, pressure is applied to the solar cell with a cushioned weight.

FIG. 6 is a view for explaining how the adhesive spreads, wherein 1 is the same as FIG. 8, and 10 and 11 are the same as FIG. As shown in FIG. 6, in the first stage, the adhesive is spread at two points of the application section A10 on the honeycomb panel. At this time, since the adhesive is spread slowly, there is no entrapment of air bubbles.

Next, in the second stage, the four points of the four corners of the solar cell of the application section B11 come into contact with the honeycomb panel, and the adhesive is spread. At this time, since the adhesive is slowly pushed and spread, there are no air bubbles inside. Finally, the diagram shown in the third stage is obtained, and there is no air bubble included, and bonding is possible.

In addition, the actual bonding step is appropriately automated, such as using a manipulator, or using a pressure head or a water head for pressurization, for installation of the solar cell 1 and application and transfer of the adhesive. Needless to say, this is also good.

FIG. 7 shows a metal mask of a conventional bonding method,
FIG. 3 is a comparative chart with the coating method of the first embodiment. FIG. 7 is a comparison diagram of a bonding method using a dispenser, a bonding method using a conventional metal mask, and a bonding method according to the present embodiment with respect to a bonding state and workability.

The bonding method of this embodiment provides an excellent bonding method which has a larger bonding area and almost no bubbles in the bonding layer as compared with the conventional bonding method. In particular, since the bubbles in the adhesive layer are suppressed by using this bonding method, a decrease in thermal conductivity due to the presence of the bubbles,
Further, it is possible to prevent a decrease in reliability caused by damage to the solar cell due to expansion of bubbles in a vacuum.

In addition, since no metal mask is used for maintenance, no metal cleaning cost is required.
Cost reduction is possible.

[0037]

As described above, by suppressing the bubbles in the adhesive layer when the solar cell is adhered to the object to be bonded, the heat transfer coefficient due to the bubbles is reduced, and the heat radiation characteristics due to the expansion of the bubbles in a vacuum. The deterioration of the metal mask is prevented, and there is no need to replace the metal mask due to abrasion of the metal mask from the viewpoint of maintenance, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an application pattern of a solar cell according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing supply of an adhesive to a solar cell by a dispenser.

FIG. 3 is a diagram illustrating how the adhesive spreads after being applied.

FIG. 4 is a diagram illustrating a method of pressurizing a solar cell on a honeycomb panel with a weight with a sponge.

FIG. 5 is a diagram illustrating a bonding step of the solar cell according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating how the adhesive spreads.

FIG. 7 is a comparative chart of a metal mask of a conventional bonding method and a coating method of the first embodiment.

FIG. 8 is a diagram showing a configuration of a solar cell.

FIG. 9 is a diagram showing an embodiment in which a solar cell is mounted on a honeycomb panel.

FIG. 10 is a diagram showing a configuration of a conventional metal mask.

FIG. 11 is a diagram showing a problem in a conventional metal mask bonding method.

FIG. 12 is a diagram showing a state where a solar cell is attached to a panel by a conventional metal mask bonding method.

[Explanation of symbols]

1 solar cell, 2 adhesive, 3 honeycomb panel,
4 metal mask, 5 opening, 6 frame, 7
Coating stand, 8 protrusions, 9 air bubbles, 10 coating section A,
11 application part B, 12 syringe, 13 weight with sponge

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Okubo 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 4F211 AD08 AG03 AH33 TA03 TC02 TD11 TN58 TN67 TQ01

Claims (7)

[Claims] 1. A method of manufacturing a solar cell panel by bonding a plurality of solar cells to a honeycomb panel, wherein a first step of applying an adhesive to a surface of the plurality of solar cells with a dispenser; A second step of reversing the surface of the solar cell panel to which the adhesive has been applied in one step and disposing it on the honeycomb panel;
And a third step of applying pressure using a pressing weight via a cushion from above with the back surface of the solar cell panel disposed on the upper surface of the honeycomb panel in the second step facing upward. A method for bonding a solar cell panel, characterized in that: 2. The application section according to claim 1, wherein the application section A includes two points at the center of the solar cell and the application section A includes four points at the periphery of the solar cell.
And a coating portion B comprising a point. 3. The center coordinates of the application section according to claim 2, wherein the Y coordinate of the application section A is on the center line of the bonding area of the solar cell, and the X coordinate is two points targeting the center line of the bonding area. A method for bonding a solar cell panel, wherein the application part B is centered on a square of a quadrilateral in which the bonding area of the solar cell is reduced. 4. The method according to claim 2, wherein the amount of the adhesive applied to the application section A is equal to or less than the amount of the adhesive applied to the application section B.
A method for bonding a solar cell panel, wherein a larger amount of the adhesive is applied. 5. A method for bonding solar cells, wherein the viscosity of the adhesive used for applying the dispenser according to claim 1 is 26000 CPS or less. 6. A method of bonding solar cell panels according to claim 4, wherein the pressing is performed independently for each solar cell. 7. A solar cell panel manufactured by the method for bonding solar cell panels according to claim 1.