JP5683522B2 - Solar cell module - Google Patents

Description

  The present invention relates to a solar cell module.

  A bypass diode is usually used as the diode in the terminal box for the solar cell module. The bypass diode is used to bypass the module whose electromotive force is reduced when the solar cell module is shaded or the like when the sunlight is no longer irradiated, thereby reducing the loss of the entire system.

  In general, in a solar cell module, when some solar cells are shaded and are not exposed to sunlight and are in an unpowered state, the unpowered solar cells work in resistance. For this reason, the solar cell in the non-power generation state may generate heat and deteriorate due to current flowing from the solar cell in the power generation state.

  In order to prevent such deterioration of the solar battery cell, a diode called a bypass diode is usually provided in the terminal box. The diode generates heat when a current flows. For this reason, if the heat generated by the diode cannot be sufficiently released, the rated temperature may be exceeded and the diode may be damaged.

  As a technique for improving the heat dissipation efficiency of the bypass diode, Patent Document 1 discloses a technique for suppressing the temperature rise by bringing the heat of the diode into the terminal box case by bringing the heat dissipation member into contact with the diode. ing.

JP 2008-251856 A

  However, in the above conventional technology, the heat conducted to the terminal box is transferred to the solar cell panel back cover member, but polyethylene, fluororesin, etc., which are generally used as the back cover material, have low thermal conductivity. , Could not diffuse the heat efficiently. Therefore, it is necessary to increase the heat capacity by enlarging the heat dissipating member inside the terminal box, and there is a problem that the terminal box becomes large.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the solar cell module which can diffuse efficiently the heat | fever transmitted to the housing | casing of a terminal box from the bypass diode installed in the terminal box.

  In order to solve the above-described problems and achieve the object, the present invention provides a structure in which a plurality of solar cells are sandwiched between a front cover member and a back cover member, and a part of the plurality of solar cells. A solar cell module having a bypass diode that bypasses a solar cell having a reduced electromotive force when the electromotive force is reduced, and a terminal box for electrically connecting a plurality of solar cells, the back surface It is formed using a material having a higher thermal conductivity than that of the cover member, and is provided with a heat diffusion member that is fixed on the back cover member and overlaid with the terminal box.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the heat | fever transmitted to the housing | casing of a terminal box from the bypass diode installed in the terminal box can be spread | diffused efficiently.

FIG. 1 is a plan view showing a configuration of a terminal box of a solar cell module according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing the configuration of the first embodiment of the solar cell module according to the present invention. FIG. 3 is a rear view of the solar cell module according to the first embodiment. FIG. 4 is an enlarged perspective view of a terminal box mounting portion on the back surface of the solar cell module. FIG. 5 is an enlarged perspective view of a terminal box mounting portion on the back surface of the solar cell module. FIG. 6 is a diagram illustrating a bonding state between the terminal box and the heat diffusing member of the solar cell module according to the second embodiment. FIG. 7 is a diagram illustrating a bonding state between the terminal box and the heat diffusing member of the solar cell module according to the third embodiment. FIG. 8 is a diagram illustrating a bonding state between the terminal box and the heat diffusing member of the solar cell module according to the third embodiment.

  Embodiments of a solar cell module according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a plan view showing the configuration of Embodiment 1 of the terminal box of the solar cell module according to the present invention, and shows the internal structure through the lid portion. In the terminal box 12, diodes 3a and 3b that are used as bypass diodes for bypassing the solar cells whose electromotive force is reduced when the electromotive force of some of the plurality of solar cells are reduced are installed. Yes.

  The terminal board 1a is fixed to the housing 5 by the protrusions of the terminal board attachment portion 6a. The terminal board 1a supports the diode 3a, and a diode foot 4b having a polarity on the N side of the diode 3a is soldered and electrically connected. The terminal board 1a and the diode 3a are fixed by a rivet 2a. The terminal board 1a and the cable 7a are caulked and electrically connected.

  A diode foot 4a having a polarity on the P side of the diode 3a is soldered and electrically connected to the terminal board 1b. The terminal board 1b is fixed to the housing 5 by the protrusions of the terminal board mounting portion 6b. The terminal board 1b supports the diode 3b, and a diode foot 4d having a polarity on the N side of the diode 3b is soldered and electrically connected. The terminal board 1b and the diode 3b are fixed by a rivet 2b. A diode foot 4c having a polarity on the P side of the diode 3b is soldered and electrically connected to the terminal board 1c. The terminal board 1c is fixed to the housing 5 by the protrusions of the terminal board attaching portion 6c. The terminal board 1c and the cable 7b are caulked and electrically connected.

  FIG. 2 is a perspective view showing the configuration of the first embodiment of the solar cell module according to the present invention. FIG. 3 is a rear view of the solar cell module according to the first embodiment. The solar cell module 8 includes a plurality of solar cells 9 connected in series, a front cover member 20 with high translucency, a back cover member 11 with excellent weather resistance, and a resin encapsulated between them. A frame 10 made of aluminum in a rectangular frame shape that supports the structural body 21 that protects the battery and a terminal box 12 that is attached to the back cover member 11 and extracts the output of the solar cell module 8.

  4 and 5 are enlarged perspective views of the terminal box mounting portion on the back surface of the solar cell module. The terminal box 12 is fixed to the back surface cover member 11 of the solar cell module 8 with the heat diffusion member 13 interposed therebetween. The heat diffusion member 13 is formed using a material (for example, metal) having a higher thermal conductivity than the back cover member 11. The heat diffusing member 13 is provided with a hole 14 through which the output terminal 15 of the solar cell module 8 is passed. The back cover member 11 and the heat diffusing member 13 are adhesives applied to the heat diffusing member 13 in advance. Thus, the output terminal 15 is fixed in a state of passing through the hole 14.

  The terminal box 12 is fixed with an adhesive or the like on the heat diffusion member 13 in which the output terminal 15 is passed through the hole 14. The output terminal 15 is connected to the terminal plates 1 a to 1 c inside the terminal box 12.

  The adhesive used for fixing the terminal box 12 to the heat diffusion member 13 and fixing the heat diffusion member 13 to the back cover member 11 is not limited to the heat transfer adhesive containing the heat transfer filler, but the heat transfer filler. It is also possible to apply a normal adhesive that does not contain.

  The heat transmitted to the casing 5 of the terminal box 12 can be efficiently diffused by the heat diffusing member 13. Since the thermal diffusion member 13 is insulated from the charging parts (terminal plates 1a, 1b, 1c, diodes 3a, 3b, cables 7a, 7b) of the terminal box 12, a metal material can be used and an inexpensive material is used. be able to.

  Since the heat sources in the terminal box 12 are the diodes 3a and 3b, the heat generated by the diodes 3a and 3b can be efficiently diffused by increasing the area of the heat diffusing member 13 in a portion near them. In the terminal box 12 whose internal structure is shown in FIG. 1, the diodes 3a and 3b, which are heat sources, are arranged close to the side from which the cables 7a and 7b are drawn. For this reason, heat diffusion performance can be improved by making the heat-diffusion member 13 into a shape where a width | variety spreads toward the opposite side from the side from which the cables 7a and 7b are pulled out.

  Although the case where the heat diffusion member 13 is larger than the joining surface of the terminal box 12 is taken as an example here, the heat diffusion member 13 may be smaller than the joining surface of the terminal box 12. As described above, since the heat sources in the terminal box 12 are the diodes 3a and 3b, any size and shape including portions corresponding to these may be used. That is, if the heat diffusion member 13 having higher thermal conductivity than the back cover member 11 is larger than the diodes 3a and 3b, the heat transmitted from the diodes 3a and 3b to the heat diffusion member 13 via the housing 5 is transferred to the back surface. It is possible to diffuse more efficiently than the cover member 11.

  According to the present embodiment, it is possible to efficiently diffuse the heat generated by the bypass diode installed in the terminal box and transmitted to the casing of the terminal box. Further, the terminal box can be reduced in size as compared with the configuration in which the heat dissipation member is provided in the terminal box.

Embodiment 2. FIG.
6A and 6B are diagrams illustrating a joining state of the terminal box and the heat diffusing member of the solar cell module according to the second embodiment, in which FIG. 6A is an upper surface side of the terminal box, and FIG. Viewed from the bottom side of the box. The adhesive 17 applied to the terminal box 12 is exposed at the hole 16 when the terminal box 12 is attached to the heat diffusing member 13. Therefore, the terminal box 12 can be bonded to the back cover member 11 with the heat diffusing member 13 sandwiched by using the adhesive 17 exposed at the hole 16. In this manner, the terminal box 12 can be bonded to both the heat diffusion member 13 and the back cover member 11 by the adhesive 17 applied to the terminal box 12.

  The adhesive 17 may be applied to the back cover member 11. Further, the hole 16 may have a shape different from the shape shown in FIG.

  Others are the same as in the first embodiment.

Embodiment 3 FIG.
7 and 8 are diagrams showing the terminal box and the heat diffusing member of the solar cell module according to the third embodiment. FIG. 7 shows a state before joining, and FIG. 8 shows a state after joining. 7A is a viewpoint of the upper surface side of the terminal box, and FIG. 7B is a viewpoint of the bottom surface side of the terminal box. The two fitting claws 18 formed on the heat diffusion member 13 are formed by cutting and raising. That is, a U-shaped cut is formed on the flat plate, and the plate is bent and raised on one side where there is no cut.

  A fitting recess 19 to which the fitting claw 18 of the heat diffusion member 13 is attached is formed on the side surface of the terminal box 12. The heat dissipating member 13 can be attached to the terminal box 12 by the fitting claw 18 and the fitting recess 19, and these can be handled as one part, so that no adhesive or other parts for attachment are required. It is.

  Others are the same as in the first embodiment.

  The method for joining the terminal box 12 and the heat diffusing member 13 described in the above embodiments is an example, and the present invention is not limited to these methods. Further, the terminal box 12 and the heat diffusing member 13 can be integrally formed.

  As described above, the solar cell module and the solar cell module terminal box according to the present invention are useful in that heat generated from the bypass diode can be efficiently dissipated, and in particular, some solar cells are shaded. It is suitable for application to solar cell modules installed in possible locations.

DESCRIPTION OF SYMBOLS 1a, 1b, 1c Terminal board 2a, 2b Rivet 3a, 3b Diode 4a, 4b, 4c, 4d Diode leg 5 Case 6a, 6b, 6c Terminal board attaching part 7a, 7b Cable 8 Solar cell module 9 Solar cell 10 Frame 11 Back cover member 12 Terminal box 13 Heat diffusion member 14, 16 hole 15 Output terminal 17 Adhesive 18 Fitting claw 19 Fitting recess 20 Front cover member 21 Structure

Claims (3)

A structure in which a plurality of solar cells are sandwiched between a front cover member and a back cover member;
A terminal that has a bypass diode that bypasses the solar cell in which the electromotive force is reduced when a part of the electromotive force of the plurality of solar cells is reduced, and that electrically connects the plurality of solar cells. A solar cell module with a box,
It is formed using a material having a higher thermal conductivity than the back cover member, and is fixed on the back cover member, and includes a heat diffusing member on which the terminal box is placed,
The heat diffusing member has a hole at a position overlapping with a portion of the terminal box to which the adhesive is applied,
The terminal box, in the rear surface cover member in the portion of the hole, solar cell module that is characterized in that in the portion other than the portion of the hole are bonded to the heat diffusion member. The heat diffusion member has a fitting claw,
The terminal box has a fitting recess on a side surface,
The solar cell module according to claim 1, wherein the terminal box is fixed to the heat diffusion member by fitting the fitting claw and the fitting recess. The solar cell module according to claim 1 or 2 wherein the heat diffusion member is formed of a metal material.

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