JP2014003230A - Terminal box and solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a terminal box which reduces heat stress occurring in fillers filling a first space including joining parts between output lines from solar cells and terminal boards and a second space which does not contain the joining parts, and to obtain a solar cell module.SOLUTION: A terminal box includes: a circuit part 22 which includes multiple terminal boards 1a to 1c electrically connected with solar cells; a housing 5 housing the circuit part 22; a division wall 14 dividing an internal space of the housing 5 into a first space 15, which houses a portion including joining parts of output lead wires 20 of the circuit part 22 and the terminal boards 1a to 1c, and a second space 16 housing a portion of the circuit part 22 which does not include the joining parts; a first filler 18 which fills the first space 15 after the output lead wires 20 are joined with the terminal boards 1a to 1c and covers the circuit part in the first space 15; and a second filler 19 which fills the second space 16 and covers the circuit part in the second space 16. The division wall 14 forms an air layer 17 between the first space 15 and the second space 16.

Description

  The present invention relates to a terminal box and a solar cell module.

  In general, in a solar cell module, when some of the solar cells are in an unpowered state due to a shadow being lost and not being exposed to sunlight, 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 terminal box for taking out the output from the solar battery module is usually provided with a diode called a bypass diode.

  The bypass diode is used to circumvent the solar battery cell in which the photovoltaic module has been lowered due to no sunlight being irradiated, such as a shadow on the solar battery module, and to reduce the loss of the entire module.

  Generally, a diode generates heat when a current flows. For this reason, if the heat generated by the bypass diode cannot be sufficiently released, the bypass diode may exceed the rated temperature and may be damaged. In order to prevent breakage of the bypass diode, the terminal box is filled with a filler to promote heat dissipation from the bypass diode.

  In the conventional terminal box, the terminal box case is attached to the laminated module, and the terminal box circuit part is filled with the filler after soldering the output lead wire to the terminal board. It is performed by the procedure of. In this attachment process, it took a lot of time to solidify the filler, which was a neck tact.

  As a technique for solving this problem, Patent Document 1 discloses that a second space is divided into a first space including a joint portion between the output cable and the circuit portion and a second space not including the joint portion. A method comprising: a manufacturing step of filling a second filler into a solid and solidifying; and an attachment step of joining the output lead wire and the circuit portion and then filling the first filler into the first space is disclosed. Has been.

JP 2010-287624 A

  However, in the above-described conventional technique, there is a problem in that each filler receives thermal stress through the partition wall unless care is taken in selecting materials for thermal stress such as the linear expansion coefficient of the filler in each space. there were.

  This invention is made | formed in view of the above, Comprising: It fills with each of the 1st space containing the junction part of the output line from a photovoltaic cell and a terminal board, and the 2nd space which does not contain a junction part. It aims at obtaining the terminal box and solar cell module which reduced the thermal stress which generate | occur | produces in a filler.

  In order to solve the above-described problems and achieve the object, the present invention provides a circuit unit including a plurality of terminal plates connected to a solar battery cell, a housing that houses the circuit unit, and a space inside the housing. Is divided into a first space that accommodates a portion including a junction between the output line from the solar cell of the circuit portion and the terminal plate, and a second space that accommodates a portion not including the junction of the circuit portion. A first filler that fills the first space after the wall, the output line, and the terminal plate are joined to cover the circuit portion in the first space; and a second filler that covers the circuit portion in the second space. And the partition wall is characterized in that an air layer is formed between the first space and the second space.

  According to the present invention, thermal stress generated in the filler filled in each of the first space including the joint portion between the output line from the solar battery cell and the terminal plate and the second space not including the joint portion is reduced. There is an effect that can be done.

FIG. 1 is a perspective view showing the configuration of the first embodiment of the solar cell module according to the present invention. FIG. 2 is a rear view of the solar cell module according to the first embodiment. FIG. 3 is a plan view showing the configuration of the first embodiment of the terminal box of the solar cell module according to the present invention. FIG. 4: is a top view which shows the structure of Embodiment 2 of the terminal box of the solar cell module concerning this invention.

  Hereinafter, embodiments of a terminal box solar cell module according to the present invention will be described 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 perspective view showing the configuration of the first embodiment of the solar cell module according to the present invention. FIG. 2 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 13 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.

  FIG. 3 is a plan view showing the configuration of the first embodiment of the terminal box of the solar cell module according to the present invention, and shows the internal structure through the lid portion. Installed in the terminal box 12 are diodes 3a and 3b used as bypass diodes for bypassing the solar cells 9 whose electromotive force is reduced when the electromotive force of some of the solar cells 9 is reduced. Has been.

  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 output cable 7a for taking out the output current to the outside of the solar cell module 8 and the terminal plate 1a 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 output cable 7b for taking out the output current to the outside of the solar cell module 8 and the terminal plate 1c are caulked and electrically connected.

  A space inside the housing 5 is divided into a first space 15 and a second space 16 by a partition wall 14, and an air layer 17 is formed between the first space 15 and the second space 16. The first space 15 is filled with the first filler 18, and the second space 16 is filled with the second filler 19 and solidified.

  Since the air layer 17 is formed between the first space 15 and the second space 16, the first filler 18 filled in the first space 15 and the second filler filled in the second space 16. Since the stress due to the thermal deformation of 19 can be absorbed by the air layer 17, it is not necessary to consider the effects of the first filler 18 and the second filler 19 respectively. That is, the first filler 18 and the second filler 19 are thermally expanded so as to swell toward the air layer 17, thereby suppressing generation of thermal stress.

  Further, since the first space 15 and the second space 16 are separated by the partition wall 14, the first filler 18 and the second filler 19 can be of different types. The first filler 18 and the second filler 19 may be the same type.

  Since the first filler 18 is filled in the first space 15 after joining the output lead wire (output line) 20 and the terminal plates 1a to 1c, that is, after being attached to the solar cell module 8, the thermosetting filler. Is selected, the solar cell module 8 must also be heated, and it is necessary to secure a large space for heating. On the other hand, since the second filler 19 filled in the second space 16 can be filled before being attached to the solar cell module 8, it is added only by the terminal box 12 when a thermosetting filler is selected. Heating is possible, and it is not necessary to take a large space for heating. For this reason, the terminal space is filled by filling the first space 15 with an ultraviolet curable or two-component mixed first filler 18 and filling the second space 16 with a thermosetting second filler 19. In installing the solar battery 12, it is not necessary to heat the entire solar cell module 8, and the productivity is improved. If there is no inconvenience in securing a space for heating, the second filler 19 filled in the second space 16 may be a thermosetting type.

  The partition wall 14 is integrally formed with the housing 5 and the terminal plates 1a to 1c. When the partition wall 14 is handled as a separate part, there is a structure that ensures water tightness so that the first filler 18 and the second filler 19 filling the first space 15 and the second space 16 do not leak to the air layer 17 side. Although necessary, by forming the partition wall 14 integrally with the housing 5 and the terminal plates 1a to 1c, water tightness can be reliably ensured without causing an increase in manufacturing cost.

  When the partition wall 14 is handled as a separate part, the partition wall 14 is welded to the housing 5 with heat or ultrasonic waves, or a packing is interposed between the partition wall 14 and the housing 5, It is possible to have a structure that ensures water tightness.

Embodiment 2. FIG.
FIG. 4 is a plan view showing the configuration of the terminal box of the solar cell module according to the second embodiment of the present invention, and shows the internal structure through the lid portion. In the present embodiment, the output cables 7 a and 7 b that extract the output current to the outside of the solar cell module 8 are connected to the terminal plates 1 a and 1 c in the first space 15.

  In the present embodiment, it is possible to fill the second space 16 with the second filler 19 and harden it before the output cables 7a and 7b are connected to the terminal plates 1a and 1c. Therefore, a work space for arranging the output cables 7a and 7b during the filling and curing of the second filler 19 is not necessary, and the terminal box 12 can be easily handled and the productivity is improved.

  Others are the same as in the first embodiment.

  As described above, the terminal box and solar cell module 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 may be shaded. It is suitable for application to solar cell modules installed in the place.

1a, 1b, 1c Terminal plate 2a, 2b Rivet 3a, 3b Diode 4a, 4b, 4c, 4d Diode foot 5 Housing 6a, 6b, 6c Terminal plate mounting portion 7a, 7b Output cable 8 Solar cell module 9 Solar cell DESCRIPTION OF SYMBOLS 10 Frame 11 Back cover member 12 Terminal box 13 Front cover member 14 Partition wall 15 1st space 16 2nd space 17 Air layer 18 1st filler 19 2nd filler 20 Output lead wire 21 Structure 22 Circuit part

Claims (6)

A circuit unit including a plurality of terminal plates connected to the solar cells;
A housing that houses the circuit portion;
A space inside the housing, a first space that accommodates a portion of the circuit portion that includes a joint portion between the output line from the solar cell and the terminal plate, and a portion that does not include the joint portion of the circuit portion. A partition wall that is divided into a second space that accommodates
A first filler that fills the first space after the output line and the terminal plate are joined to cover the circuit portion in the first space;
A second filler that fills the second space and covers the circuit portion in the second space;
With
The terminal box, wherein the partition wall forms an air layer between the first space and the second space.   The terminal box according to claim 1, wherein the partition wall is integrally formed with the housing.   The terminal box according to claim 1, wherein the first filler and the second filler are different in curing method.   The terminal box according to claim 3, wherein the first filler is a thermosetting type.   5. The terminal box according to claim 1, wherein an output cable for taking out an output current to the outside is connected to the circuit unit in the first space. 6.   The solar cell module which installed the terminal box of any one of Claim 1 to 5 in the back surface side of the structure which pinched | interposed the several photovoltaic cell connected in series with the front cover member and the back surface cover member .

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