CN201345366Y - Thin film solar battery module group with series-parallel connection structure - Google Patents

Abstract

The utility model discloses a series-parallel structure thin-film solar cell module group. The substrate of the module group is provided with several battery modules, and each battery module includes a bottom conductive film, a power generation layer, and a top conductive layer sequentially arranged on the substrate. The printed electrodes on the film and the top conductive film, the battery module is divided into several module units by tangent grooves, the bottom conductive film is provided with holes at the ends of the module units, and the top conductive film and the power generation layer are respectively provided in the module units. The narrow hole, one side of the narrow hole extends to the first module unit with a front extension hole, and the two ends of the printed electrode extend to the bottom conductive film of the previous module unit in the front extension hole, and the two adjacent first module units are arranged side by side. The top conductive films are electrically connected, and the bottom conductive films of the last module unit are electrically connected. The series connection and parallel connection between the module units of the utility model are directly completed through the printed electrodes, no need to weld external conductors and connect with wires, the process is simple, and the structure is stable.

Description

Thin-film solar cell module group with series-parallel structure

technical field

The utility model relates to a series-parallel structure thin-film solar battery module group.

Background technique

Thin-film solar cells have become the most promising new type of solar cells due to the characteristics of low material consumption, low cost and wide application, and have become a key project and hot topic in the research and development of photovoltaic technology in the world today. Its types include silicon-based thin-film solar cells, CdTe cadmium telluride-based thin-film solar cells, and CIS copper-indium-selenium-based thin-film solar cells. Although these different types of thin-film solar cells have different structures, they can generally be summarized as : A structure in which a substrate, a conductive layer, a power generation layer and a conductive layer are distributed sequentially, wherein the power generation layer includes a buffer layer and a semiconductor absorption layer.

In order to reduce the times of scribing and cleaning of thin-film solar cell modules, the applicant has proposed a new thin-film solar cell module structure, as shown in Figure 1, which includes a bottom conductive film and a top conductive film on the substrate. Film, and the power generation layer sandwiched between the bottom conductive film and the top conductive film, the battery module is divided into several module units by a number of tangential grooves that cut off the top conductive film, the power generation layer and the bottom conductive film. There are protruding parts 11 extending outward in the direction of both ends of the module unit, and the bottom conductive film extends outwards with a protruding part 8 covering part of the protruding part 11. The top conductive film of each module unit is provided with a printing electrode, and the two ends of the printed electrode are connected to the two protruding parts 8 of the next module unit. The first external conductor 12 is welded to the protrusion of the first module unit of the battery module, and the two ends of the printed electrode of the last module unit of the battery module are welded to the second external conductor 13 . Therefore, when connecting different battery modules, additional wires need to be used to connect between the first external conductors 12 or the second external conductors 13 of different battery modules. On the one hand, such a connection method needs to weld the external conductor to the battery module, which may cause damage to the battery module during the welding process; on the other hand, the welding point may become loose, oxidized, etc., resulting in poor contact and affecting the use of the battery .

Contents of the invention

The purpose of the utility model is to provide a series-parallel thin-film solar battery module group, in which the series connection between the module units of the same battery module and the parallel connection between different battery modules are directly completed by coating or printing, and there is no need to weld external conductors and Connected by wires, the process is simple and the structure is stable.

The technical scheme of the utility model is: a series-parallel structure thin-film solar cell module group, including a substrate, a plurality of battery modules are arranged on the substrate, and each battery module includes a bottom layer sequentially arranged on the substrate The conductive film, the power generation layer, the top conductive film, and the printed electrodes on the top conductive film, the battery module is divided into several module units by a number of tangent grooves that cut off the top conductive film, the power generation layer, and the bottom conductive film, and two adjacent battery modules They are separated by tangent grooves, the bottom conductive film is provided with a hole at the end of the module unit, and the hole close to the side of the previous module unit coincides with the tangent groove, and the top layer conductive film and the power generation layer are respectively There is a narrow hole located on the notch, one side of the narrow hole extends to a module unit with a front extension hole, and the narrow hole is located in the notch on the inner side of the module unit in the length direction; the printed electrode is close to the notch The end of the hole extends from the narrow hole to the bottom conductive film of the previous module unit in the front extending hole.

The further technical solution of the utility model is: a series-parallel structure thin-film solar cell module group, including a substrate, and a plurality of battery modules are arranged on the substrate, and each of the battery modules includes sequentially arranged on the substrate The bottom conductive film, the power generation layer, the top conductive film, and the printed electrodes on the top conductive film. The battery module is divided into several module units by a number of tangent grooves that cut off the top conductive film, the power generation layer, and the bottom conductive film. Two adjacent batteries The modules are separated by tangent grooves. The bottom conductive film is provided with a hole at the end of the module unit. The hole close to the side of the previous module unit coincides with the tangent groove. The top conductive film and the power generation layer Narrow holes are respectively provided on the gap holes, one side of the narrow holes extends to a module unit with a front extension hole, and the narrow holes are located in the gap holes on the inner side of the module unit in the length direction; the printed electrodes are close to The end of the hole extends from the narrow hole to the bottom conductive film of the previous module unit in the front extending hole.

The hole is an opening exposing the substrate formed by digging away part of the underlying conductive film.

The void is a hole composed of closed tangent slots on the underlying conductive film, and the tangent slots of the void are filled with the power generation layer.

The module units of the two adjacent battery modules are arranged in the same direction, the top conductive film of the first module unit of the two adjacent battery modules is electrically connected, and the bottom conductive film of the last module unit is electrically connected to each other. electrical connection between.

The tangent groove on the bottom conductive film is filled with a power generation layer, and the printed electrodes on the top conductive film of the first module unit of the two adjacent battery modules are in communication with each other.

The adjacent gap holes on the two battery modules adjacent to each other communicate with each other, and the other side of the narrow hole opposite to the front extension hole has a rear extension hole extending out of the gap hole of the module unit, and the side-by-side Printed connection electrodes are connected between the bottom conductive films in the rear extension holes of the last module unit of two adjacent battery modules.

The module units of the two adjacent battery modules are arranged in opposite directions, the last module unit of the previous battery module is adjacent to the first module unit of the next battery module, and the last module unit of the previous battery module The bottom conductive film of the module unit is electrically connected with the top conductive film of the first module unit of the next battery module through printed electrodes.

The utility model advantage is:

1. In this utility model, different battery module coatings of thin-film solar cells are processed and formed on the same substrate, and the series connection between the module units of the same battery module and the parallel connection between different battery modules are directly completed by coating or printing electrodes, without further Welding is performed to weld the external conductors on the battery module, and at the same time, it is no longer necessary to use wire connections, which simplifies the processing technology and avoids possible damage to the battery module during welding.

2. Multiple battery modules of the utility model are processed on the same substrate, and at the same time, their series and parallel connections are directly completed by printing printed electrodes, with reliable connection and stable structure.

Description of drawings

Fig. 1 is a schematic structural diagram of the prior art;

Fig. 2 is the structural representation of the specific embodiment of the present invention;

Fig. 3 is the enlarged schematic view of the I place of Fig. 2;

4 to 10 are schematic diagrams of processing steps of another specific embodiment of the present invention.

Among them: 1 battery module; 2 substrate; 3 bottom conductive film; 4 top conductive film; 5 power generation layer; Printed electrode; 10 printed connection electrode; 11 protruding part; 12 first external conductor; 13 second external conductor; 14 missing hole; 141 side; 15 narrow hole; Holes; 18 gaps; 19 wire electrodes; 20 transparent protective layers.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Example:

Specific embodiment one:

As shown in Figures 2 and 3, a series-parallel structure of thin film solar cell module groups includes a substrate 2 on which several battery modules 1 are arranged, and each of the battery modules 1 includes a The bottom conductive film 3 on the bottom 2, the power generation layer 5 on the bottom conductive film 3, the top conductive film 4 on the power generation layer 5, and the printed electrodes 9 on the top conductive film 4, the battery module 1 is composed of several cut-off top conductive films 4. The power generation layer 5 and the tangent groove 6 of the bottom conductive film 3 are divided into several module units 7, and the bottom conductive film 3 is provided with a hole 14 at both ends of the module unit 7, and the hole 14 is close to the previous module unit 7 The side of the top layer of the conductive film 4 and the power generation layer 5 are respectively provided with a narrow hole 15 on the gap 14 at both ends of the module unit 7, and one side of the narrow hole 15 faces upwards to a module unit 7 The front extension hole 16 is extended, and the substrate 2 is exposed where the gap 14 and the narrow hole 15 overlap, and the bottom conductive film 3 is exposed where the narrow hole 15 protrudes from the gap 14, that is, the front extension hole 16 The exposed part is the bottom conductive film 3 . The inner edge of the narrow hole 15 in the length direction of the module unit 7 is located in the cutout hole 14 , so that the underlying conductive film 3 on the side of the cutout hole 14 will not be exposed and connected to the printed electrode 9 .

Two adjacent battery modules 1 are separated by a tangent groove 6 . In FIG. 2 , the cutout holes 14 and the narrow holes 15 at the adjacent ends of two adjacent battery modules 1 are respectively butted and communicated at the tangent groove 6 .

The two ends of the printed electrode 9 extend from the substrate 2 in the narrow hole 15 to the bottom conductive film 3 of the previous module unit 7 in the front extension hole 16, so that the front and back adjacent two module units on the same battery module 1 7 are connected in series through printed electrodes 9.

The tangent groove 6 on the bottom conductive film 3 is filled with the power generation layer 5 , and the printed electrodes 9 on the top conductive film 4 of the first module unit 7 a of the two adjacent battery modules 1 are in communication with each other. The other side of the narrow hole 15 opposite to the front extension hole 16 has a rear extension hole 17 extending out of the cutout hole 14 of the module unit 7, and the last module unit 7b of the two adjacent battery modules 1 extends rearward. The printed connection electrodes 10 located in the cutout holes 14 are connected between the underlying conductive films 3 in the holes 17 . In this way, different battery modules 1 are connected in parallel.

The processing method of the above-mentioned series-parallel structure thin-film solar cell module group comprises the following steps:

1), plating a bottom conductive film 3 on the substrate 2;

2) Digging the hole 14 on the bottom conductive film 3, so that the substrate 2 at the hole 14 is exposed, and drawing a tangent groove separating the module unit 7 and the battery module 1 on the bottom conductive film 3;

3), then plate the power generation layer 5 and the top layer of conductive film 4 sequentially on the bottom conductive film 3, and the tangent groove of the bottom conductive film 3 is filled by the power generation layer 5 there;

4), dig out a narrow hole 15 on the top conductive film 4 and the power generation layer 5, and draw a tangent groove separating the module unit 7 and the battery module 1 on the top conductive film 4 and the power generation layer 5;

5) Finally, print the printed electrodes 9 and printed connecting electrodes 10 .

Specific embodiment two:

As shown in Figure 7, a series-parallel structure of thin-film solar cell module groups includes a substrate 2 on which several battery modules 1 are arranged, and each of the battery modules 1 includes The bottom conductive film 3, the power generation layer 5, the top conductive film 4, and the printed electrodes 9 on the top conductive film 4, the battery module 1 is composed of several tangent grooves that cut off the top conductive film 4, the power generation layer 5, and the bottom conductive film 3. 6 is divided into several module units 7, and two adjacent battery modules 1 are separated by a tangent groove 6. The bottom conductive film 3 is provided with a hole 14 at the left end of all the module units 7, and the hole 14 is close to The side 141 of the previous module unit 7 coincides with the tangent groove 6, and the top layer conductive film 4 and the power generation layer 5 are respectively provided with narrow holes 15 on the gap 14, and the side of the narrow hole 15 faces up to the next module unit 7. A front extension hole 16 is extended, and the inner side 151 of the narrow hole 15 in the length direction of the module unit 7 is located in the cutout hole 14; the end of the printed electrode 9 close to the cutout hole 14 extends from the narrow hole 15 to the front extension On the underlying conductive film 3 of the previous module unit 7 in the hole 16 .

The hole 14 is a hole formed by a closed tangent groove 6 on the bottom conductive film 3, and the tangent groove 6 of the hole 14 is filled with a power generation layer 5, that is, the bottom conductive film 3 inside and outside the hole 14 is covered with The wire cutting slot 6 and the power generation layer 5 filled in the wire cutting slot 6 are insulated and separated.

In this embodiment, the left end of the power generation layer 5 and the top conductive film 4 of each battery module 1 is completely excavated to form a narrow hole 15 and a front extension hole 16 connected back and forth, so that the bottom conductive film 3 at the left end of each battery module 1 is covered. exposed, and then part of the hole 14 at the end is also exposed.

The module units 7 of the two adjacent battery modules 1 are arranged in opposite directions, and the last module unit 7b of the previous battery module 1 is adjacent to the first module unit 7a of the next battery module 1. The bottom conductive film 3 of the last module unit 7 b of a battery module 1 is electrically connected to the top layer conductive film 5 of the first module unit 7 a of the next battery module 1 through printed electrodes 9 . Wherein the notch 14 of the first module unit 7a of each battery module 1 is provided with a notch 18 near the tangent groove on the side of the last module unit 7b of the previous module unit 1, so the last module of the last battery module 1 The bottom conductive film 3 of the unit 7b is naturally electrically connected with the bottom conductive film 3 in the hole 14 of the first module unit 7a of the next battery module 1 at the gap 18, and is located in the hole 14 and the first module The printed electrodes 9 on the top conductive film 4 of the unit 7 a also function as printed connection electrodes 10 . In this way, all the modular units 7 on the substrate 2 are connected in series.

When the width of the module unit 7 is relatively large, generally greater than 6 mm, several herringbone-shaped branch lines intersecting the main line of the printed electrode 9 can also be arranged on the printed electrode 9 on the top conductive film 5, as shown in FIG. 8 .

When connecting to the outside, the connection end of the printed electrode 9 of the first module unit 7a of the first battery module 1 and the last module unit 7b of the last battery module 1 can be exposed to the underlying conductive film outside the hole 14 3 are welded with wire electrodes 19 respectively, as shown in FIG. 9 . After the wire electrodes 19 are welded, a transparent protective layer 20 can also be coated on the surface of the entire thin-film solar battery module group, as shown in FIG. 10 .

The processing method of the above series-parallel structure thin film solar cell module group is shown in Figure 4 to Figure 10, including the following steps:

1), plating a bottom conductive film 3 on the substrate 2;

2) Draw a tangent groove on the bottom conductive film 3, the tangent groove separates the module unit 7 and the battery module 1 and forms a cutout 14, wherein the cutout 14 of the first module unit 7a of each battery module 1 is close to the upper A notch 18 is provided on one side of the last modular unit 7b of a modular unit 1, as shown in FIG. 4 ;

3), then sequentially plate the power generation layer 5 and the top conductive film 4 on the bottom conductive film 3;

4), dig out a narrow hole 15 on the top conductive film 4 and the power generation layer 5, and draw a tangent groove separating the module unit 7 and the battery module 1 on the top conductive film 4 and the power generation layer 5, as shown in Figure 5 and Figure 6 shown;

5), finally print the printed electrode 9, as shown in Figure 7;

6), when the width of the module unit 7 is greater than 6 millimeters, on the printed electrode 9 on the top conductive film 5, some fishbone-shaped branch lines crossing the main line of the printed electrode 9 can also be plated, as shown in Figure 8;

7) Solder the connecting end of the printed electrode 9 of the first module unit 7a of the first battery module 1 and the bottom conductive film 3 exposed outside the notch 14 of the last module unit 7b of the last battery module 1 Wire electrode 19, for connecting with the outside, as shown in Figure 9;

8) After the wire electrodes 19 are welded, a transparent protective layer 20 can also be coated on the surface of the entire thin-film solar battery module group, as shown in FIG. 10 .

In the present invention, a plurality of battery modules are arranged on one substrate, and the series connection between the module units of the same battery module and the parallel connection or series connection between different battery modules are directly completed through printed electrodes, without the need for welding external conductors and using wires for connection. Simple and stable structure.

Claims (7)

1. A thin-film solar cell module group of series-parallel structure, comprising a substrate (2), characterized in that: several battery modules (1) are arranged on the substrate (2), and each battery module (1) ) includes a bottom conductive film (3), a power generation layer (5), a top conductive film (4) and a printed electrode (9) on the top conductive film (4) which are sequentially arranged on the substrate (2), and the battery module (1) It is divided into a number of module units (7) by a number of tangent grooves (6) that cut off the top conductive film (4), the power generation layer (5) and the bottom conductive film (3), between two adjacent battery modules (1) The bottom conductive film (3) is provided with a hole (14) at the end of the module unit (7), and the hole (14) is close to the previous module unit (7). The side (141) of the side (141) coincides with the tangent groove (6), and the top conductive film (4) and the power generation layer (5) are respectively provided with a narrow hole (15) on the hole (14), and the narrow hole ( 15) A front extension hole (16) is extended from one side to a module unit (7), and the narrow hole (15) is located in the cutout hole (14) on the inner side (151) of the module unit (7) in the length direction; The end of the printed electrode (9) close to the hole (14) extends from the narrow hole (15) to the bottom conductive film (3) of the previous module unit (7) in the front extension hole (16). 2. The thin-film solar cell module group with series-parallel structure according to claim 1, characterized in that: the hole (14) is an opening to expose the substrate (2) formed by digging away part of the underlying conductive film (3) . 3. The thin-film solar cell module group of series-parallel structure according to claim 1, characterized in that: the hole (14) is a hole formed by a closed tangent groove (6) on the bottom conductive film (3), The power generation layer (5) is filled in the tangent groove (6) of the said hole (14). 4. The thin-film solar cell module group with series-parallel structure according to claim 1, characterized in that: the module units (7) of the two adjacent battery modules (1) arranged side by side have the same arrangement direction, and the side-by-side phase The top conductive films (4) of the first module unit (7a) of two adjacent battery modules (1) are electrically connected, and the bottom conductive films (3) of the last module unit (7b) are electrically connected. 5. The thin-film solar cell module group of series-parallel structure according to claim 4, characterized in that: the tangent groove (6) on the bottom conductive film (3) is filled with a power generation layer (5), and the side-by-side The printed electrodes (9) on the top conductive film (4) of the first module unit (7a) of two adjacent battery modules (1) are connected to each other. 6. The thin-film solar cell module group with series-parallel structure according to claim 4, characterized in that: the adjacent gaps (14) on the two adjacent battery modules (1) communicate with each other, and the The other side of the narrow hole (15) opposite to the front extension hole (16) has a rear extension hole (17) extending outside the notch (14) of the module unit (7), and the two adjacent battery modules (1) Printed connection electrodes (10) are connected between the underlying conductive films (3) in the rear extension hole (17) of the last module unit (7b). 7. The thin-film solar cell module group with series-parallel structure according to claim 1, characterized in that: the module units (7) of the two adjacent battery modules (1) are arranged in opposite directions, and the last battery module The last module unit (7b) of (1) is adjacent to the first module unit (7a) of the next battery module (1), and the last module unit (7b) of the previous battery module (1) The bottom conductive film (3) is electrically connected with the top conductive film (5) of the first module unit (7a) of the next battery module (1) through printed electrodes (9).

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