CN204067391U - solar cell module - Google Patents

Abstract

A solar cell module comprises a plurality of solar cell elements and a plurality of conductive adhesive tapes. Each solar cell element comprises a plurality of P-type bus electrodes and a plurality of n-type bus electrodes which are parallel to each other and are staggered. The conductive adhesive tape is adhered to the p-type bus electrodes and the n-type bus electrodes, so that the p-type bus electrode of the first solar cell element is connected with the n-type bus electrode of the second solar cell element adjacent to the p-type bus electrode of the first solar cell element through the conductive adhesive tape, and if the first solar cell element is adjacent to the third solar cell element, the n-type bus electrode of the first solar cell element is connected with the p-type bus electrode of the third solar cell element through the conductive adhesive tape. The utility model discloses use conducting strip to connect a plurality of solar cell component to simplify the processing procedure of solar cell component module.

Description

solar cell module

technical field

The utility model relates to a solar battery module, in particular to a solar battery module using conductive adhesive strips to connect a plurality of solar elements. the

Background technique

For the traditional solar cell structure, the upper electrode is arranged on the upper surface of the silicon substrate, and the lower electrode is arranged on the lower surface of the silicon substrate. However, the upper surface of the silicon substrate is used to receive sunlight, so the upper electrode on the upper surface will block part of the incident light, thereby reducing the photoelectric conversion efficiency of the solar cell. Therefore, the current technology has developed to move the upper electrode to the lower surface of the silicon substrate, so that the upper and lower electrodes (or p-type electrodes and n-type electrodes) are arranged on the lower surface of the silicon substrate together. A solar cell with this structure is called Back contact solar cells. Back contact solar cells can be roughly divided into four types of structures: interdigitated back contact (IBC) solar cells, emitter wrap through (EWT) back electrode solar cells, metal penetration (metallization wrap through, MWT) back electrode solar cells and metallization wrap around (MWA) back electrode solar cells, among which interdigitated back electrode solar cells are more common. the

Please refer to the top view of a conventional interdigitated back electrode solar cell 100 shown in FIG. 1 . As shown in FIG. 1 , a conventional solar cell 100 includes an n-type diffusion region 111, a p-type diffusion region 121, an n-type bus electrode 112, a p-type bus electrode 122, a plurality of n-type finger electrodes 113, and a plurality of p-type finger electrodes. shape electrode 123 . The n-type diffusion region 111 is arranged in a comb shape, and the p-type diffusion region 121 surrounds the n-type diffusion region 111 . In addition, the p-type bus electrode 122 and the plurality of p-type finger electrodes 123 are all disposed on the p-type diffusion region 121 and electrically connected to each other. The n-type bus electrode 112 and the plurality of n-type finger electrodes 113 are all disposed on the n-type diffusion region 111 and electrically connected to each other. the

In addition, for the interdigitated back electrode solar cell 100, when the light irradiates the upper surface of the silicon substrate and generates electron-hole pairs, the electrons will gather toward the n-type diffusion region 111, and the electron holes will flow toward the p-type diffusion region 121. gather. However, for the electron-hole pairs generated on the surface of the silicon substrate above the center of the n-type diffusion region 111, if the holes move to the distance of the p-type diffusion region 121, then the electrons move to the n-hole below it. The distance between the diffused regions 111 is relatively long. In addition, for the electron holes generated on the surface of the silicon substrate above the center of the p-type diffusion region 121, if the electrons want to move to the distance of the n-type diffusion region 111, compared with the distance that the holes need to move to the p-type region below it. The distance from the type diffusion region 121 is relatively far. It is worth noting that in the n-type silicon substrate, the holes generated on the surface of the substrate by light irradiation belong to the minority carriers, while the electrons belong to the majority carriers. Therefore, if the area of the n-type diffusion region 111 is too large, the distance for the holes to move to the p-type diffusion region 121 is too long, and the minority carriers (holes) are easily lost during the movement, causing short-circuit current (short circuit current) circuit current, Isc) decreases, which in turn affects the photoelectric conversion efficiency of solar cells. However, if the area of the n-type diffusion region 111 is reduced, the conduction resistance of the majority carriers will be affected. In addition, a larger area of the p-type diffusion region 121 is beneficial to collect more minority carriers to increase Isc, thereby increasing the photoelectric conversion efficiency of the solar cell. However, the larger p-type diffusion region 121 will make the distance for electrons to move to the n-type diffusion region 111 longer. When the resistance value of electron movement becomes larger, the fill factor (fill factor, FF) will be reduced, thereby reducing the photoelectric conversion. efficiency. the

In order to solve the problems caused by too large n-type diffusion area or too large p-type diffusion area under the bus electrode, US Patent No. 7,804,022 discloses the solar cell element shown in Figure 2A, and US Patent No. 2005/0268959 discloses Figure 2B A solar cell module containing two solar cell elements. the

Please refer to FIG. 2A , the solar cell element 200 includes a bus electrode 202 and a finger electrode 204. Compared with the traditional square rectangular bus electrode with too large area, the bus electrode 202 of the solar cell element 200 is reduced into a plurality of square patterns and configured In the edge region of the solar cell element 200 . In other words, when the area of the bus electrode 202 is reduced, it means that the area of the diffusion region under the bus electrode 202 can also be reduced at the same time, which can solve the problem of excessive n-type diffusion region or excessive p-type diffusion region under the bus electrode 202. problems caused by the region. However, there is no bus electrode 202 in the middle region of the above-mentioned solar cell element 200. Therefore, for electrons or holes, the distance to converge from the finger electrode 204 to the bus electrode 202 becomes longer. This does not utilize the conduction of electrons or holes. In addition, because the shrunk bus electrodes 202 of the solar cell element 200 are arranged on the edge of the element, the finger electrodes 203 located at the edge region of the solar cell element 200 need to be rearranged so that the finger electrodes 204 can be directly connected to the shrunk bus electrode 204. Square bus electrodes 202 . the

See also Figure 2B. Due to the special design of the above-mentioned bus electrodes 202, it is impossible to connect the bus electrodes 202 in series between the cells with the solar cell elements 200a and the cells with the solar cell elements 200b using the traditional serial welding technology, so a special design is required. Only the welding ribbon 206 can realize the series connection of two battery slices. the

In order to solve the above disadvantages, the utility model provides a solar cell module using conductive adhesive strips to connect a plurality of solar cell elements, which can simplify the modularization process of the solar cell elements. the

Utility model content

The utility model provides a solar battery module, which uses conductive adhesive strips to connect multiple solar battery elements to simplify the modularization process of the solar battery elements. the

The utility model provides a solar battery module, including: a plurality of solar battery elements, wherein each solar battery element includes:

A plurality of p-type bus electrodes and a plurality of n-type bus electrodes parallel to each other and arranged in a staggered manner, wherein the plurality of p-type bus electrodes and the plurality of n-type bus electrodes of any two adjacent solar cell elements in reverse order; and

A plurality of conductive adhesive strips, pasted on the plurality of p-type bus electrodes and the plurality of n-type bus electrodes, so that the p-type bus electrodes of the first solar cell element are connected to the n-type bus electrodes of the adjacent second solar cell elements. n-type bus electrodes are connected through the conductive adhesive strips, and if the first solar cell element is also adjacent to the third solar cell element, the n-type bus electrodes of the first solar cell element and the third solar cell The p-type bus electrodes of the components are connected through the conductive adhesive strips. the

The utility model provides a solar battery module, including: a plurality of solar battery elements, wherein each solar battery element includes:

A plurality of p-type bus electrodes and a plurality of n-type bus electrodes arranged parallel to each other in a staggered manner, wherein the arrangement of the plurality of p-type bus electrodes and the plurality of n-type bus electrodes of any two adjacent solar cell elements in the same order; and

A plurality of conductive adhesive strips, pasted on the plurality of p-type bus electrodes and the plurality of n-type bus electrodes, so that the p-type bus electrodes of the first solar cell element and the adjacent second solar cell elements The n-type bus electrode is connected through the conductive adhesive strip, and if the first solar cell element is also adjacent to the third solar cell element, the n-type bus electrode of the first solar cell element is connected to the third solar cell element. The p-type bus electrodes of the battery elements are connected through the conductive adhesive strips. the

Description of drawings

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings. in:

1 is a top view of a conventional interdigitated back electrode solar cell 100;

FIG. 2A is a schematic structural view of a solar cell element disclosed in U.S. Patent No. 7,804,022;

Figure 2B is a solar cell module comprising two solar cell elements disclosed in US Patent US2005/0268959;

Figure 3A is a solar cell element to be modularized in a specific embodiment of the present invention;

Fig. 3B is a solar cell module comprising the solar cell element of Fig. 3A in a specific embodiment of the utility model;

Fig. 4A is the solar cell element to be modularized in another specific embodiment of the present invention;

Fig. 4B is a solar cell module comprising the solar cell element of Fig. 4A in another specific embodiment of the utility model; and

FIG. 5 is a solar cell module including the solar cell element of FIG. 4A in another embodiment of the present invention. the

Detailed ways

To illustrate the gist of the practical information, please refer to FIG. 3A and FIG. 3B , which are respectively a solar cell element 300 to be modularized and a solar cell module 350 including the solar cell element 300 according to a specific embodiment of the present invention. As shown in FIGS. 3A and 3B , a solar battery module 350 includes a plurality of battery elements 300 . It should be noted that in this specific embodiment, a combination of three solar cell elements 300 is used as an illustration, but not limited thereto. However, those skilled in the art can appropriately make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model should be defined by the scope of the claims of this application. defined shall prevail. the

In FIG. 3A and FIG. 3B , each solar cell element 300 includes: a plurality of p-type bus electrodes 301 and a plurality of n-type bus electrodes 302 arranged parallel to each other and staggered, wherein any two adjacent solar cell elements 300 The arrangement order of the plurality of p-type bus electrodes 301 and the plurality of n-type bus electrodes 302 is opposite. The multiple p-type bus electrodes 301 and the multiple n-type bus electrodes 302 of the solar cell element 300 are respectively used to connect the p-type interdigitated back electrode and the n-type interdigitated back electrode on the solar cell element 300 (not shown in the figure). ), and the interdigitated back electrodes are perpendicular to the bus electrodes 301 and 302 . The structure and arrangement of the interdigitated back electrodes are prior art and will not be repeated in this specification. the

In FIG. 3B , a plurality of conductive adhesive strips 305 are pasted on top of the plurality of p-type bus electrodes 301 and the plurality of n-type bus electrodes 302 of the solar cell element 300 . The p-type bus electrode of the first solar cell element 300 is connected to the n-type bus electrode of the second solar cell element 300 adjacent to it through the conductive adhesive strip 305, and if the first solar cell element 300 is also connected to the third solar cell element 300 adjacent to each other, the n-type bus electrode of the first solar cell element 300 is connected to the p-type bus electrode of the third solar cell element 300 through the conductive adhesive strip 305 . Wherein, the first, second and third are only used to distinguish three different solar cell elements, and do not impose any limitation on the solar cell elements. the

Preferably, as shown in FIG. 3B , the plurality of conductive adhesive strips 305 are long strips. the

The utility model also provides another specific embodiment, please refer to FIG. 4A and FIG. 4B , which are respectively another specific embodiment of the utility model to be modularized solar cell element 400 and a solar module including the above-mentioned solar cell element 400 450. As shown in FIG. 4A and FIG. 4B , the solar cell module 350 includes a plurality of solar cell elements 400 . It should be noted that in this specific embodiment, a combination of three solar cell elements 400 is used as an illustration, but not limited thereto. However, those skilled in the art can properly make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection of the present utility model should be within the scope of the claims of this application defined shall prevail. the

In FIG. 4A and FIG. 4B , each solar cell element 400 includes: a plurality of p-type bus electrodes 401 and a plurality of n-type bus electrodes 402 arranged parallel to each other and staggered, wherein any two adjacent solar cell elements 400 The arrangement order of the plurality of p-type bus electrodes 401 and the plurality of n-type bus electrodes 402 is the same. The plurality of p-type bus electrodes 401 and the plurality of n-type bus electrodes 402 of the solar cell element 400 are respectively used to connect the p-type interdigitated back electrode and the n-type interdigitated back electrode on the solar cell element 400 (not shown in the figure). ), and the interdigitated back electrodes and the bus electrodes 401 and 402 are perpendicular to each other. However, the structure and arrangement of the interdigitated back electrodes are prior art and will not be repeated in this specification. the

As in FIG. 4B , multiple conductive adhesive strips 405 are pasted on the multiple p-type bus electrodes 401 and the multiple n-type bus electrodes 402 of the solar cell element 400 . The p-type bus electrode of the first solar cell element 400 is connected to the n-type bus electrode of the second solar cell element 400 adjacent to it through the conductive adhesive strip 405, and if the first solar cell element 400 is also connected to the third solar cell element 400 adjacent to each other, the n-type bus electrode of the first solar cell element 400 is connected to the p-type bus electrode of the third solar cell element 400 through the conductive adhesive strip 405 . the

Preferably, as shown in FIG. 4B , the plurality of conductive adhesive strips 405 are long strips with zigzag bends in the middle. the

It must be noted that the shape of a plurality of conductive adhesive strips 405 shown in Figure 4B is only a specific embodiment of the utility model, which is characterized in that the p-type bus electrodes 401 and n-type bus electrodes connected by the conductive adhesive strips 405 402 produces an offset on two adjacent solar cell elements 400 . Therefore, the shapes of the plurality of conductive adhesive strips 405 shown in FIG. 4B cannot be used to limit the present invention. For example, the present invention can also provide another solar cell module including the solar cell element shown in FIG. 4A , as shown in FIG. 5 . the

In FIG. 5 , a solar cell module 550 includes a plurality of solar cell elements 400 . The solar cell element 400 has been described above, so it will not be repeated. The difference between the shapes of the multiple conductive strips 405 shown in Figure 5 and Figure 4B is that the multiple conductive strips 505 in Figure 5 are long strips with an S-shaped bend in the middle, and the p-type bus connected The electrode 401 and the n-type bus electrode 402 are offset on two adjacent solar cell elements 400 . the

Although the utility model has been disclosed using the above specific embodiments, it is not intended to limit the utility model. Those with ordinary knowledge in the technical field of the utility model should be able to use it without departing from the spirit and scope of the utility model. Various changes and modifications, so the protection scope of the present utility model should be defined by the scope of the claims of the present application. the

Claims (5)

1. A solar cell module, characterized in that it comprises: a plurality of solar cell elements, wherein each solar cell element comprises: A plurality of p-type bus electrodes and a plurality of n-type bus electrodes parallel to each other and arranged in a staggered manner, wherein the plurality of p-type bus electrodes and the plurality of n-type bus electrodes of any two adjacent solar cell elements in reverse order; and A plurality of conductive adhesive strips, pasted on the plurality of p-type bus electrodes and the plurality of n-type bus electrodes, so that the p-type bus electrodes of the first solar cell element are connected to the n-type bus electrodes of the adjacent second solar cell elements. n-type bus electrodes are connected through the conductive adhesive strips, and if the first solar cell element is also adjacent to the third solar cell element, the n-type bus electrodes of the first solar cell element and the third solar cell The p-type bus electrodes of the components are connected through the conductive adhesive strips. 2 . The solar cell module according to claim 1 , wherein the plurality of conductive adhesive strips are long strips. 3 . 3. A solar cell module, characterized in that it comprises: a plurality of solar cell elements, wherein each solar cell element comprises: A plurality of p-type bus electrodes and a plurality of n-type bus electrodes arranged parallel to each other in a staggered manner, wherein the arrangement of the plurality of p-type bus electrodes and the plurality of n-type bus electrodes of any two adjacent solar cell elements in the same order; and A plurality of conductive adhesive strips, pasted on the plurality of p-type bus electrodes and the plurality of n-type bus electrodes, so that the p-type bus electrodes of the first solar cell element and the adjacent second solar cell elements The n-type bus electrode is connected through the conductive adhesive strip, and if the first solar cell element is also adjacent to the third solar cell element, the n-type bus electrode of the first solar cell element is connected to the third solar cell element. The p-type bus electrodes of the battery elements are connected through the conductive adhesive strips. 4 . The solar cell module according to claim 3 , wherein the plurality of conductive adhesive strips are long strips with zigzag bends in the middle. 5 . The solar cell module according to claim 3 , wherein the plurality of conductive adhesive strips are long strips with S-shaped bends in the middle.