CN201369335Y - Photovoltaic cell module - Google Patents

Abstract

The utility model provides a photovoltaic cell module contains photovoltaic diode, electrically conductive frame and circuit substrate. The photovoltaic diode defines a front side and a back side, and has a first electrode and a second electrode respectively located on the front side and the back side. The conductive frame is located on the front side of the photovoltaic diode and provided with an opening to form an inner edge. The first electrode is connected with the inner edge of the conductive frame so that the photovoltaic diode is positioned below the conductive frame, and the photovoltaic diode is exposed in the opening. The circuit substrate is positioned at the rear side of the photovoltaic diode and is provided with a first conductive contact, a second conductive contact and a conductive bump which are overlapped above the first conductive contact and extend upwards to be connected with the conductive frame. The second conductive contact is connected to the second electrode. The first conductive contact is electrically connected to the first electrode through the conductive bump and the conductive frame. The utility model discloses utilize conductive frame to combine conductive bump to replace the lead wire structure of knowing, avoid using the transparent sealing glue of knowing or viscose to improve the cracked problem of thermal ageing.

Description

Photovoltaic cell module

technical field

The utility model relates to a photovoltaic cell module, in particular to a photovoltaic cell module with a conductive frame structure.

Background technique

FIG. 1A shows a conventional photovoltaic cell module 10 . As shown in the figure, the photovoltaic cell module 10 includes a circuit substrate 11 ; a heat sink 12 ; a photovoltaic cell chip 13 ; and a condenser lens 14 . The photovoltaic cell chip 13 can absorb external light and convert it into electric current and send it out through the circuit substrate 11 . The radiator 12 is used to dissipate the heat generated by the photovoltaic cell chip 13 . The condenser lens 14 is used to focus the light on the photovoltaic cell chip 13 . The circuit substrate 11 includes conductive contacts 111 . Through the lead wire 15 , the conductive contact 111 is electrically connected to the electrode 13P of the photovoltaic cell chip 13 . Adhesive 17 is provided at the connection interface between the lead wire 15 and the electrode 13P or the conductive contact 111 to stabilize the connection with each other. FIG. 1B shows another conventional photovoltaic cell module 100 , whose structure is substantially the same as that of the photovoltaic cell module 10 . The photovoltaic cell module 100 likewise has a condenser lens but is not shown here. The photovoltaic cell module 100 also includes a transparent sealant 19 covering it to protect the photovoltaic cell chip 13 and the leads 15 .

The conventional photovoltaic cell module 10 or 100 has many disadvantages. For example, wire bonding is a very cumbersome and relatively expensive step in the process, and leads will occupy a lot of space. In addition, in order to increase the power generation efficiency, the conventional photovoltaic cell module 10 or 100 increases the focusing ratio of the condensing lens 14 as much as possible, but this is accompanied by many problems. For example, a high degree of focus tends to concentrate a large amount of ultraviolet light and heat near the photovoltaic cell chip 13, which will easily lead to deterioration of the components near the photovoltaic cell chip 13 in the long run, such as the adhesive 17 or transparent sealant 19 made of organic materials. It is easy to crack due to aging. Therefore, a novel structure is needed to improve the known problems.

Utility model content

In view of the above known disadvantages, the utility model provides a photovoltaic cell module with a conductive frame and conductive bumps, wherein the photovoltaic cell chip is disposed under the conductive frame, and the conductive bump is disposed on a circuit substrate carrying the photovoltaic cell chip. The utility model uses a conductive frame combined with a conductive bump to replace the known lead structure, avoiding the problem of using the conventional transparent sealant or viscose to improve thermal aging and cracking.

In one embodiment, the present invention provides a photovoltaic cell module, comprising a photovoltaic diode, defining a front side and a rear side, and the photovoltaic diode has a first electrode and a second electrode respectively located on the front side and the rear side side; a conductive frame is located on the front side of the photovoltaic diode, the conductive frame has an opening to form an inner edge, the first electrode is connected to the inner edge so that the photovoltaic diode is exposed in the opening; a circuit substrate is located on the On the rear side of the photovoltaic diode, the circuit substrate has a conductive bump extending upward to connect with the conductive frame, wherein the first electrode of the photovoltaic diode is electrically connected to the circuit substrate through the conductive frame and the conductive bump.

In another embodiment, the present invention provides a photovoltaic cell module as described above, further comprising an inorganic transparent layer covering the conductive frame.

In yet another embodiment, the present invention provides a photovoltaic cell module as described above, wherein the inorganic transparent layer further includes a concentrating lens for concentrating light on the photovoltaic diode.

In yet another embodiment, the present invention provides a photovoltaic cell module as described above, further comprising a reflective layer disposed above the inorganic transparent layer, and the reflective layer has a cavity corresponding to the opening of the conductive frame.

In yet another embodiment, the present invention provides a photovoltaic cell module as described above, further comprising a sealing element connecting the conductive frame and the circuit substrate to define a closed space, and the closed space accommodates the photovoltaic diode.

Description of drawings

1A and 1B are schematic diagrams of conventional photovoltaic cell modules;

2A is a schematic cross-sectional view of the photovoltaic cell module of the first embodiment of the present invention;

Fig. 2B is a top view of each component of the photovoltaic cell module in Fig. 2A;

3 is a top view of the conductive frame of the second embodiment of the present invention;

4 is a schematic cross-sectional view of a photovoltaic cell module according to a third embodiment of the present invention;

5A is a schematic cross-sectional view of a photovoltaic cell module according to a fourth embodiment of the present invention;

5B is a top view of the reflective layer of the fourth embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a photovoltaic cell module according to a fifth embodiment of the present invention.

Description of main component symbols

10 photovoltaic cell modules

11 circuit substrate

111 Conductive contacts

12 Radiator

13 Photovoltaic cell chip

13P electrode

14 Condenser lens

15 leads

17 viscose

19 Transparent sealant

100 photovoltaic cell modules

200 photovoltaic cell modules

210 photovoltaic diodes

210a front side

210b rear side

211 first electrode

212 second electrode

220 conductive frame

221 opening

222 inner edge

230 circuit substrate

231 The first conductive contact

232 Second conductive contact

233 conductive bump

240 inorganic transparent layer

320 conductive frame

321 opening

322 inner edge

400 photovoltaic cell modules

410 photovoltaic diodes

421 opening

440 inorganic transparent layer

441 Concentrating lens

500 photovoltaic cell modules

510 photovoltaic diodes

520 conductive frame

521 opening

540 inorganic transparent layer

550 reflective layers

551 Pockets

600 photovoltaic cell modules

610 photovoltaic diodes

630 circuit substrate

633 conductive bump

640 inorganic transparent layer

660 sealing element

661 Enclosed space

Detailed ways

Preferred embodiments of the present utility model will be exemplified below with reference to the accompanying drawings. Similar elements in the attached drawings use the same element numbers. It should be noted that in order to clearly present the utility model, the components in the accompanying drawings are not drawn according to the scale of the actual object, and in order to avoid obscuring the content of the utility model, the following description also omits known components, related materials, and related components. processing technology.

FIG. 2A is a schematic cross-sectional view of a photovoltaic cell module 200 according to the first embodiment of the present invention. FIG. 2B is a top view of components of the photovoltaic cell module 200 . As shown in FIG. 2A , the photovoltaic cell module 200 includes a photovoltaic diode 210 , a conductive frame 220 , a circuit substrate 230 , and an inorganic transparent layer 240 . Photovoltaic diode 210 defines a front side 210a and a back side 210b. The photovoltaic diode 210 has a first electrode 211 and a second electrode 212 located on the front side 210a and the rear side 210b respectively. The conductive frame 220 is located on the front side 210 a of the photovoltaic diode 210 . The conductive frame 220 has an opening 221 to form an inner edge 222 . The first electrode 211 is connected to the inner edge 222 of the conductive frame 220 so that the photovoltaic diode 210 is located under the conductive frame 220, and the light-absorbing part of the photovoltaic diode 210 is exposed in the opening 221. The circuit substrate 230 is located on the rear side 210b of the photovoltaic diode. The circuit substrate 230 has a first conductive contact 231 , a second conductive contact 232 , and a conductive bump 233 stacked above the first conductive contact 231 and extending upward to connect the conductive frame 220 . The inorganic transparent layer 240 is located above the conductive frame 220 and covers the opening 221 of the conductive frame 220 .

Referring to FIG. 2A and FIG. 2B, the photovoltaic diode 210 is made of semiconductor materials doped with different electrical properties, forming a p-n junction (p-n junction). The front and rear sides of the photovoltaic diode 210 are provided with a first electrode 211 and a second electrode 212 with different electrical properties, the material of which can be any suitable conductive metal, such as titanium, silver, platinum, gold, tin, nickel, copper or the like. alloys etc. The first electrode 211 further includes a first portion 211a having a patterned structure for transmitting current generated by the light; and a second portion 211b surrounding the first portion 211a. The second part 211b is used to concentrate the current transmitted by the first part 211a, wherein the second part 211b is connected to the inner edge 222 of the conductive frame 220 (shown by a dotted line in the figure). The conductive frame 220 can be made of any suitable conductive material, preferably a high temperature resistant metal, such as copper or aluminum. It should be noted that the present invention does not limit the shape of the conductive frame 220 , and the rectangle shown in the figure only represents an example.

Also referring to FIG. 2A and FIG. 2B , the circuit substrate 230 can be a common printed circuit board, and the first conductive contact 231 and the second conductive contact 232 are used as contacts for electrical contact with the photovoltaic diode 210 . The second conductive contact 232 is connected to the second electrode 212 . The conductive bump 233 disposed above the first conductive contact 231 can serve as a support for the conductive frame 220 , and the first conductive contact 231 is electrically connected to the first electrode 211 through the conductive bump 233 and the conductive frame 222 . The conductive bump 233 can be composed of composite materials of metal particles and polymer compounds, such as gold, tin, copper, silver, nickel, chromium, lead, aluminum, etc. or alloys thereof. The inorganic transparent layer 240 covering the conductive frame 220 is mainly used to protect the underlying photovoltaic diode 210 . The inorganic transparent layer 240 can be made of high temperature resistant transparent inorganic material, such as glass, crystal and so on.

It should be noted that the conductive frame 220 of the first embodiment can be changed as needed. FIG. 3 shows a top view of a conductive frame 320 according to a second embodiment of the present invention. Other elements of the second embodiment can refer to the first embodiment. As shown in the figure, the inner edge 322 of the conductive frame 320 has a sawtooth shape, so the opening 321 also has a sawtooth shape, and its function is to adjust the thermal expansion and contraction of the conductive frame 320 when it encounters temperature changes, so as to prevent Photovoltaic cell modules develop cracks that lead to short circuits.

FIG. 4 illustrates a photovoltaic cell module 400 according to a third embodiment of the present invention. As shown in the figure, the difference between the photovoltaic cell module 400 and the photovoltaic cell module 200 is that the inorganic transparent layer 440 further includes a concentrating lens 441 covering the opening 421 . The condenser lens 441 can be made of any suitable material, and its main purpose is to concentrate the light on the photovoltaic diode 410 .

FIG. 5A is a schematic cross-sectional view of a photovoltaic cell module 500 according to a fourth embodiment of the present invention. FIG. 5B is a top view of the reflective layer 550 of the photovoltaic cell module 500 . The difference between the photovoltaic cell module 500 and the photovoltaic cell module 200 is that the photovoltaic cell module 500 further includes a reflective layer 550 disposed above the inorganic transparent layer 540 . The reflection layer 550 has a cavity 551 corresponding to the opening 521 of the conductive frame 520 . Light can pass through the inorganic transparent layer 540 to enter the photovoltaic diode 510 through the cavity 551 . The reflective layer 550 can reflect light toward the inorganic transparent layer 520 but not toward the opening 521 , so as to prevent the light from penetrating the inorganic transparent layer 540 and irradiating the conductive frame 520 to increase the heat of the photovoltaic cell module 500 . The reflective layer 550 can be made of any suitable material, such as gold, silver, aluminum, titanium, copper or alloys thereof.

FIG. 6 is a schematic cross-sectional view of a photovoltaic cell module 600 according to a fifth embodiment of the present invention. The difference between the photovoltaic cell module 600 and the photovoltaic cell module 200 is that the photovoltaic cell module 600 further includes a sealing element 660 connecting the conductive frame 620 and the circuit substrate 630 to define a closed space 661 . Enclosed space 661 houses photovoltaic diode 610 . The enclosed space 661 may also include conductive bumps 633 or other elements. The closed space 661 may be filled with air, or preferably filled with an appropriate amount of inert gas or nitrogen to slow down the oxidation of the components in the closed space 661 .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model; all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present utility model should be included in Within the scope of the utility model.

Claims (10)

1. photovoltaic battery module is characterized in that comprising:

Photovoltaic diode, definition front side and rear side, this photovoltaic diode has first electrode and second electrode lays respectively at this front side and this rear side;

Conductive frame is positioned at this front side of this photovoltaic diode, and this conductive frame has opening to form inner edge, and this first electrode connects this inner edge so that this photovoltaic diode is exposed in this opening;

Circuit base plate is positioned at this rear side of this photovoltaic diode, and this circuit base plate has conductive projection and extends upward to connect this conductive frame, and wherein this of this photovoltaic diode first electrode electrically connects this circuit base plate by this conductive frame and this conductive projection.

2. photovoltaic battery module as claimed in claim 1 is characterized in that this circuit base plate also comprises first conductive junction point and second conductive junction point, and this conductive projection is stacked and placed on this first conductive junction point top.

3. photovoltaic battery module as claimed in claim 2 is characterized in that this second conductive junction point connects this second electrode.

4. photovoltaic battery module as claimed in claim 1 is characterized in that also comprising the inorganic transparent layer and covers this conductive frame.

5. photovoltaic battery module as claimed in claim 4 is characterized in that this inorganic transparent layer is glass or crystal.

6. photovoltaic battery module as claimed in claim 1 is characterized in that the material of this conductive projection is gold, tin, copper, silver, nickel, chromium, lead or aluminium or above-mentioned various alloys.

7. photovoltaic battery module as claimed in claim 4, it is characterized in that this inorganic transparent layer also comprise light-collecting lens with so that light-ray condensing in this photovoltaic diode.

8. photovoltaic battery module as claimed in claim 4 is characterized in that also comprising the top that the reflector is arranged at this inorganic transparent layer, and this reflector has pothole to this opening that should conductive frame.

9. photovoltaic battery module as claimed in claim 1 is characterized in that also comprising potted component and connects this conductive frame and this circuit base plate with the definition enclosure space, and this enclosure space holds this photovoltaic diode.

10. photovoltaic battery module as claimed in claim 9 is characterized in that this enclosure space also holds this conductive projection.

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