CN202373593U - Crystal silicon solar cell module - Google Patents

Abstract

A crystalline silicon solar module includes a crystalline silicon solar cell, which has opposite front and rear surfaces, one of the front and rear surfaces is a surface without busbar lines, and the other of the front and rear surfaces is a surface with busbar lines or No busbar surface; and first and second conductive strips, wherein the first conductive strip is attached to the front surface of the crystalline silicon solar cell sheet in a manner capable of collecting current by means of conductive glue, and the second conductive strip is attached to the front surface of the crystalline silicon solar cell sheet by means of conductive glue. The glue is attached to the rear surface of the crystalline silicon solar cell in a manner capable of collecting current. The present application can manufacture crystalline silicon solar cell modules in a low-cost, fast and efficient manner.

Description

Crystalline silicon solar cell module

technical field

The present application relates to a crystalline silicon solar cell module. the

Background technique

In recent years, solar cells have been developed rapidly, and various solar cells have made great progress in both technical and commercial aspects. Solar cells using inorganic absorbing layer materials can be divided into bulk solar cells and thin-film solar cells in terms of structure. Block solar cells are mainly monocrystalline silicon and polycrystalline silicon solar cells (hereinafter collectively referred to as crystalline silicon solar cells), the thickness is usually one hundred to several hundred microns, and it is rigid. Thin-film solar cells include amorphous silicon thin films and compound semiconductor thin-film solar cells, usually with a thickness of several microns or even less, and are flexible. the

Figures 1 and 2 show a traditional crystalline silicon solar cell. As shown in the figure, the crystalline silicon solar cell includes: a crystalline silicon wafer 1; a plurality of auxiliary gate lines 2 parallel to and separated from each other formed on the front surface of the crystalline silicon wafer for collecting current; a main gate line 4 on the front side, It traverses the sub-grid lines 2 and is fixed on the front surface of the crystalline silicon wafer 1 and is electrically connected to each sub-grid line 2. The front side main grid line and the sub-grid lines together form the front side electrodes of the solar cells; metallization layer 8, which is applied on the rear surface of the crystalline silicon wafer 1; the rear busbar 4', which is applied directly on the rear surface of the crystalline silicon wafer 1 (not shown) or applied on the metallization layer 8 (shown 2) and electrically connected with the metallization layer to form the rear electrode of the solar cell. the

Usually, the electrical connection of the battery slices (power output, series connection between battery slices, etc.) is realized by using a conductive strip (welding strip) 6 . The conductive strip 6 is in the form of a continuous strip, longitudinally having a first section (the left part shown in FIG. 1 ) and a second section (the right part shown in FIG. 1 ), the first section of one conductive strip One section is fixed on the front busbar 4 of the solar cell as shown in Figure 1, and the second section of the other conductive tape is fixed on the rear busbar 4' of the solar cell (see Figure 2 ). the

3-5 illustrate the process of fixing the conductive tape on the solar cells in the prior art. the

First, a solar cell is prepared, which, as shown in Figure 3, includes a crystalline silicon wafer 1, a sub-gate line (not shown) positioned on the front surface of the crystalline silicon wafer 1, and a front side main grid line 4, located The metallization layer 8 on the rear surface of 1 and the rear busbar 4'. the

Next, as shown in FIG. 4 , flux 10 may optionally be applied on the front surface of the front side busbar 4 . the

Next, as shown in FIG. 5 , the first section of the conductive strip 6 is attached to the front busbar 4 coated with flux 10 , and the first section of the conductive strip 6 is bonded using a thermocompression bonding tool 12 . Segments apply pressure toward the front busbar 4, and at the same time apply heat to the first section of the conductive strip 6 and the crystalline silicon wafer 1, thereby melting the fusible metal layer on the surface of the conductive strip 6, so that the first section of the conductive strip 6 The sections and the front side bus bars 4 are welded together. the

Next, although not shown, it is easy to understand that the second section of the other conductive strip is soldered to the rear side busbar on the solar cell with flux. In this way, the electric energy output of the solar cells can be realized. In the current industrial processing technology, the conductive strip can also be welded on the main grid lines 4 and 4' with a torch. the

Usually, flux is a mixture with rosin as the main component, which is an auxiliary material to ensure the smooth progress of the soldering process. In practical applications, flux can also be omitted. The fusible metal layer on the surface of the conductive strip is an alloy with a low melting point, which may be lower than 300°C or lower than 200°C, such as Sn/Pb, Sn/Ag, Sn/Ag/Pb, etc. However, compared with the whole system, a higher processing temperature (for example, above 200° C.) is still required to realize the welding between the conductive strip and the busbar. This higher processing temperature creates stress within the various components of the cell and at the interface between the various components, and this stress may cause damage to the various components of the solar cell during the welding process and in the future application process. Cracking occurs, or separation at the interface between the individual components. The higher the processing temperature, the greater the stress on the interface between the conductive tape and the battery sheet, and the greater the possibility of battery failure. the

In soldering materials, the application of lead greatly reduces the soldering temperature and increases the ease of soldering. Therefore, in order to facilitate soldering, currently commonly used conductive tapes usually contain lead, however, lead is not an environmentally friendly material. the

Therefore, it is desired to solve the problems related to the electrical connection between crystalline silicon solar cells and conductive strips in the prior art. the

Utility model content

One purpose of the present application is to solve the relevant problems caused by the electrical connection between the crystalline silicon solar cells by welding the conductive strips and the busbars on the crystalline silicon solar cells in the prior art. the

According to one aspect of the present application, a crystalline silicon solar cell module is provided, comprising:

A crystalline silicon solar cell having front and rear surfaces opposite to each other, one of the front and rear surfaces being a busbar-free surface, and the other of the front and rear surfaces being a busbar-lined surface or a busbar-free surface; and

First and second conductive strips, wherein the first conductive strip is attached to the front surface of the crystalline silicon solar cell in a manner capable of collecting current by means of conductive glue, and the second conductive strip is attached in a manner capable of collecting current by means of conductive glue Attached to the rear surface of crystalline silicon solar cells. the

According to the present application, at least one of the front and rear surfaces of the battery sheet is a busbar-free surface, which is significantly different from the prior art crystalline silicon solar battery sheet with busbar lines on both the front and back surfaces. the

Preferably, the front and rear surfaces of the battery sheet are busbar-free surfaces, and such a crystalline silicon solar battery sheet can be called a busbar-free crystalline silicon solar battery sheet. the

According to a preferred embodiment of the present application, the front surface of the crystalline silicon solar cell is formed with a plurality of auxiliary grid lines parallel to and separated from each other for collecting current, and the first conductive strip traverses these auxiliary grid lines and establishes an electrical connection with them. connect. the

According to a preferred embodiment of the present application, the front surface of the crystalline silicon solar cell is a surface without main grid lines, and the first conductive strip is directly electrically connected to the plurality of auxiliary grid lines through the conductive glue. the

According to a preferred embodiment of the present application, the rear surface of the crystalline silicon solar cell is a busbar-free surface formed by a metallization layer, and the second conductive strip is directly electrically connected to the metallization layer through the conductive glue . the

According to a preferred embodiment of the present application, the conductive glue includes a polymer and at least 0.1% by weight of conductive particles or other conductive materials dispersed in the polymer. the

According to a preferred embodiment of the present application, the polymer is selected from one or any combination of the following group: acrylate, polyethylene copolymer, epoxy resin, silicone resin. the

According to a preferred embodiment of the present application, the conductive particles are composed of one or more materials selected from the following group: gold, silver, nickel, copper, aluminum, zinc, tin, carbon nanotubes, and graphene. the

According to another preferred embodiment of the present application, the conductive glue includes a conductive polymer material. The conductive polymer material may include, but is not limited to, polyacetylene-based conductive polymer material, polythiophene-based conductive polymer material, polypyrrole-based conductive polymer material, polyaniline-based conductive polymer material, and any two or More combinations etc. the

According to a preferred embodiment of the present application, the metallization layer is an aluminum paste sintered layer. the

According to a preferred embodiment of the present application, said first and second conductive strips are made of copper. the

According to a preferred embodiment of the present application, the crystalline silicon solar cell module includes at least two crystalline silicon solar cell sheets and at least one common conductive strip including a first section and a second section; wherein, for two adjacent a crystalline silicon solar cell, the first section of the at least one common conductive strip is used as a first conductive strip attached to the front surface of the first crystalline silicon solar cell, and the at least one common conductive strip The second section of is used as a second conductive tape attached to the rear surface of the second crystalline silicon solar cell. the

According to a preferred embodiment of the present application, the first surface of the first section of the at least one common conductive strip is attached to the front surface of the first crystalline silicon solar cell, and the second region of the at least one common conductive strip The opposite second surface of the segment is attached to the rear surface of the second crystalline silicon solar cell. the

According to a preferred embodiment of the present application, the first section and the second section of the same common conductive strip are continuous with each other and approximately equal in length, or the second section is slightly shorter. the

According to a preferred embodiment of the present application, the number of common conductive strips for realizing the electrical connection between a certain crystalline silicon solar cell and an adjacent crystalline silicon solar cell is at least one, for example two or more. the

According to a preferred embodiment of the present application, for each crystalline silicon solar cell sheet, the first section of a common conductive strip attached to the front surface of its crystalline silicon sheet is the same as that attached to the rear surface of its metallization layer. The second sections of the other common conductive strip are aligned with each other. the

According to a preferred embodiment of the present application, the crystalline silicon solar cells are arranged approximately in the same plane. the

According to a preferred embodiment of the present application, the crystalline silicon solar cell module further includes: a front encapsulation layer covering the front surface of each crystalline silicon solar cell; and a rear encapsulation layer covering the rear of each crystalline silicon solar cell surface. The crystalline silicon solar cell module may further include: a front sheet covering a front surface of the front encapsulation layer; and a back sheet covering a rear surface of the rear encapsulation layer. the

According to a preferred embodiment of the present application, the front plate is a glass plate. the

According to a preferred embodiment of the present application, the front encapsulation layer and the rear encapsulation layer are respectively composed of EVA. the

According to another aspect of the present application, there is provided a method for manufacturing a crystalline silicon solar cell module, comprising the steps of: providing a crystalline silicon solar cell sheet, the crystalline silicon solar cell sheet has front and rear surfaces opposite to each other, the front and rear One of the surfaces is a busbar-free surface, and the other of the front and rear surfaces is a busbar-line surface or a busbar-free surface; providing conductive glue and first and second conductive strips; and in the crystalline silicon solar cell The first and second conductive strips are connected on the chip, wherein the first conductive strip is attached to the front surface of the crystalline silicon solar cell in a manner capable of collecting current by means of conductive glue, and the second conductive strip is used to collect current by means of conductive glue. The way of current is attached to the back surface of the crystalline silicon solar cell. the

According to a preferred embodiment of the present application, the step of connecting the first and second conductive strips on the crystalline silicon solar cell includes: applying the conductive adhesive to the front surface of the crystalline silicon solar cell in the form of a first conductive adhesive strip; In the form of two conductive adhesive strips, the conductive adhesive is applied to the rear surface of the crystalline silicon solar cell sheet; and the first conductive tape is attached to the first conductive adhesive strip on the crystalline silicon solar cell sheet, and the second conductive tape is attached to the The second conductive adhesive strip on the crystalline silicon solar cell. the

According to another preferred embodiment of the present application, the step of connecting the first and second conductive strips on the crystalline silicon solar cell includes: applying conductive glue to the first conductive strip and the second conductive strip; The second conductive tape is attached to the front surface of the crystalline silicon solar battery sheet by means of the conductive glue, and the second conductive tape is attached to the rear surface of the crystalline silicon solar battery sheet by means of the conductive glue. the

According to a preferred embodiment of the present application, the step of applying the conductive glue to the first conductive strip and the second conductive strip comprises: providing a sheet of conductive material; providing and applying conductive glue to the sheet of conductive material; and cutting the conductive sheets of material to produce the first and second conductive strips. the

According to a preferred embodiment of the present application, the step of providing the conductive glue and the first and second conductive strips includes: providing a sheet of conductive material having first and second regions; providing and applying the conductive glue to the sheet of conductive material A first surface of a first section of a first section and an opposite second surface of a second section; and cutting the sheet of conductive material to produce first and second conductive strips, the first and second conductive strips are respectively longitudinally formed by the The first section and the second section formed by the first and second sections of the sheet of conductive material; and, the step of connecting the first and second conductive strips on the crystalline silicon solar cell sheet includes: connecting the first conductive strip The first section is attached to the front surface of the crystalline silicon solar cell by means of the conductive glue, and the second section of the second conductive tape is attached to the rear surface of the crystalline silicon solar cell by means of the conductive glue . the

According to another preferred embodiment of the present application, the step of providing conductive glue and first and second conductive tapes includes: providing a sheet of conductive material having opposite first and second surfaces; providing conductive glue and applying it on a first surface and an opposite second surface of a sheet of conductive material; and cutting said sheet of conductive material to produce first and second conductive strips, the front and back of the first and second conductive strips being coated with conductive glue and, the step of connecting the first and second conductive strips on the crystalline silicon solar cells includes: attaching the first section of the first conductive strips to the front surface of the crystalline silicon solar cells by means of the conductive glue, and The second segment of the second conductive tape is attached to the rear surface of the crystalline silicon solar cell by means of the conductive glue. the

According to a preferred embodiment of the present application, the step of providing crystalline silicon solar cells includes providing at least two crystalline silicon solar cells, wherein, for two crystalline silicon solar cells adjacent to each other, the common conductive strip is simultaneously used as a sticker. The first conductive tape attached to the first crystalline silicon solar cell and the second conductive tape attached to the second crystalline silicon solar cell. the

According to a preferred embodiment of the present application, the common conductive strip has longitudinal first and second sections, the first surface of the first section is adapted to be attached to the front surface of the first crystalline silicon solar cell, the second The opposite second surface of the second segment is adapted to be attached to the rear surface of a second crystalline silicon solar cell. the

According to a preferred embodiment of the present application, the method for manufacturing a crystalline silicon solar cell module further includes: after the first and second conductive strips are connected on the crystalline silicon solar cell sheet, applying the front encapsulation layer and the rear encapsulation layer on the on the front and back surfaces of the crystalline silicon solar cells; and then applying the front and back sheets on the front and back encapsulation layers, respectively. the

According to this application, a new electrical connection method for crystalline silicon solar cells is provided, so that the main grid lines in the prior art are completely or partially canceled, and the conductive strips used to realize the electrical connection of crystalline silicon solar cells It is bonded to the auxiliary grid lines and/or the metallization layer on the front and rear surfaces of the battery sheet by means of conductive glue. Therefore, it is not necessary to completely use a high-temperature thermocompression bonding tool to realize the welding (>200° C.) between the conductive strip and the busbar line as in the prior art. At the same time, the polymer system has a lower Young's modulus and lower processing temperature than the metal system, which can greatly reduce the thermal stress generated during the bonding process of the conductive tape and the battery sheet, thereby reducing the cracking and cracking of the battery sheet as in the prior art. Separation of conductive strips and battery sheets. the

In addition, the busbars usually made of gold or silver in the prior art are completely or partially eliminated, so the cost of the entire cell can be reduced. the

In addition, since the soldering step is eliminated, the conductive tape does not have to use lead-containing materials that facilitate soldering, thus avoiding lead pollution to the environment. At the same time, the cancellation of the welding step leads to the fast and efficient completion of the series connection between crystalline silicon solar cells. the

In addition, through the design of the polymer system in the conductive adhesive, the adhesion between the conductive tape and the battery can be greatly improved. the

According to the present application, the rear busbars on the back of the battery can also be omitted. The back metal layer can cover the entire back. the

It should be pointed out that this application is applicable to crystalline silicon solar cells. Since the basic structure of crystalline silicon solar cells is obviously different from that of thin-film solar cells, the technical idea disclosed in this application about canceling all or part of the busbars and directly using conductive glue to realize the electrical connection of crystalline silicon solar cells and The details are not necessarily applicable to thin-film solar cells. Conversely, related technologies in the field of thin-film solar cells, such as proposed busbar-free thin-film solar cells, are not easy to apply to crystalline silicon solar cells, so the technology of this application cannot be made obvious. the

Description of drawings

Preferred embodiments of the application will be described below with reference to the accompanying drawings, in which:

Fig. 1 is a schematic top view when a crystalline silicon solar cell sheet of the prior art is applied with a conductive band;

Fig. 2 is a schematic side cross-sectional view of the crystalline silicon solar cell sheet in Fig. 1 after being applied with a conductive tape;

3-5 are schematic side cross-sectional views of the process in which a conductive tape is applied to the crystalline silicon solar cell in FIG. 1;

Figure 6 is a schematic top view of a crystalline silicon solar cell according to a preferred embodiment of the present application when a conductive tape is applied;

Figure 7 is a schematic side sectional view of the crystalline silicon solar cell sheet in Figure 6 after being applied with a conductive tape;

Fig. 8 is a schematic diagram when a plurality of crystalline silicon solar cells are connected in series;

Fig. 9 is a schematic diagram of a crystalline silicon solar cell module according to a preferred embodiment of the present application. the

Detailed ways

Various preferred embodiments of the present application are described below with reference to the accompanying drawings. the

Figures 6 and 7 show a crystalline silicon solar cell according to a preferred embodiment of the present application, which is a monocrystalline silicon or polycrystalline silicon solar cell, comprising: a crystalline silicon sheet 1; formed on the front surface of the crystalline silicon sheet 1 A plurality of sub-gate lines 2 (shown in FIG. 6 ) for collecting current parallel to and separated from each other; and a metallization layer 8 (shown in FIG. 7 ) covering the rear surface of the silicon wafer 1 . the

According to a preferred embodiment of the present application, at least one of the front and rear surfaces of the crystalline silicon wafer 1 is not provided with busbars as in the prior art. In other words, at least one of the front and rear surfaces is a busbar-free surface. the

According to a preferred embodiment of the present application, the front surface of the crystalline silicon wafer 1 is a busbar-free surface, and the sub-grid lines positioned on the front surface of the crystalline silicon wafer 1 are separated from each other, instead of utilizing The front busbars electrically connect them to each other. At the same time, the rear surface of the crystalline silicon wafer 1 is also a busbar-free surface, and no rear busbars are arranged on the rear surface of the crystalline silicon wafer 1 as in the prior art. the

According to another preferred embodiment of the present application, the front surface of the crystalline silicon wafer 1 is a surface without busbars, but the rear surface of the crystalline silicon wafer 1 is a surface provided with busbars (a surface with busbars). the

According to another preferred embodiment of the present application, the front surface of the crystalline silicon wafer 1 is a surface provided with busbar lines (a surface with busbar lines), but the rear surface of the crystalline silicon wafer 1 is a surface without busbar lines. the

In this application, the conductive strip 6 is used to realize the electrical connection of the battery slices (outputting the electric energy of the battery slices, realizing the series connection between the battery slices, etc.), and the conductive strip 6 attached to the front side of the battery slices is shown in FIG. 6 . the

As shown in FIG. 7 , the conductive tape 6 is adhered to the front and rear surfaces of the battery sheet by means of a conductive adhesive layer 20 . the

In the example shown in FIG. 7 , two conductive strips 6 are respectively provided on the upper and lower surfaces of the battery sheet. However, other numbers of conductive strips, such as one or more than two, are also feasible. the

In the case of connecting multiple battery slices in series to increase the output voltage and power, adjacent battery slices are connected in series through conductive strips 6 . the

The conductive strip 6 is in the form of a continuous strip having a first section (left part shown in FIG. 6 ) and a second section (right part shown in FIG. 6 ) in the longitudinal direction. As shown in Figure 6, the first section of the first conductive strip is fixed on the front side of the battery sheet across each sub-grid line 2, that is, it is attached to the front surface of the crystal silicon wafer 1, and the second section of the second conductive strip (not shown in FIG. 6 ) is fixed on the rear side of the battery sheet (see FIG. 7 ). the

For the non-main grid line surface of the battery sheet, the conductive tape is directly attached to the auxiliary grid line 2 or the metallization layer 8 through conductive glue, and directly establishes an electrical connection with it. For the surface of the battery sheet with main grid lines, the conductive tape is pasted on the main grid lines through conductive glue, and establishes electrical connection with the auxiliary grid lines 2 or the metallization layer 8 through the main grid lines. the

A situation in which multiple cells are connected in series is shown in FIG. 8 . In FIG. 8 , taking the battery sheet in the middle as an example, the first (rear) surface of the first section of the first conductive strip 6 is attached to the front surface of the battery sheet, and the second section of the first conductive strip 6 The second (front) surface of the cell is attached to the rear surface of the next cell (the cell on the right). The second (front) surface of the second section of the second conductive strip 6 is attached to the rear surface of the battery sheet, and the first (back) surface of the first section of the second conductive strip 6 is attached to the previous battery sheet (the cell on the left). the

In this way, a plurality of battery slices are connected in series through corresponding conductive strips as shown in FIG. 8 to form a battery slice group. the

The metallization layer 8 is preferably an aluminum paste sintered layer, and may also be a layer of other suitable materials. the

The conductive strip 6 is preferably made of copper, and can also be made of other suitable conductive materials, such as aluminum strip, silver-plated copper strip, copper strip coated with Sn/Ag/Pd or Sn/Pd thin layer. the

According to a preferred embodiment of the present application, the conductive adhesive material used in the conductive adhesive layer includes a conductive polymer material. the

The conductive polymer material may include, but not limited to, polyacetylene-based conductive polymer material, polythiophene-based conductive polymer material, polypyrrole-based conductive polymer material, polyaniline-based conductive polymer material, and the like. the

According to another preferred embodiment of the present application, the conductive adhesive material used in the conductive adhesive layer includes a polymer and conductive particles located in the polymer. The weight of conductive particles or other conductive materials is at least 0.1% of the weight of the conductive adhesive layer 20 . the

The polymer is preferably an ethylene copolymer or an epoxy resin, although other suitable types of polymers may be used, including thermoplastic and thermosetting polymers. Thermoplastic polymers such as acrylic copolymers, polyamides, etc.; thermosetting polymers such as polyurethanes, phenolic resins, silicone polymers, etc. the

The conductive particles are made of materials with good conductivity such as gold, silver, nickel, copper, aluminum, zinc, tin, carbon nanotubes, and graphene. the

According to a preferred embodiment of the present application, the conductive adhesive layer of the conductive tape is made of conductive adhesive containing conductive particles with acrylate as a polymer matrix, for example, Electrically Conductive Adhesive Transfer available from Strip Tinning Automotive Tape. the

After the front and rear surfaces of a battery sheet are attached with conductive strips, or after a plurality of battery sheets are connected in series to form a battery sheet group by using conductive strips as shown in Figure 8, as shown in Figure 9, the front packaging layer 22 and The rear encapsulation layer 26 is respectively applied on the front surface and the rear surface of the cell or battery sheet group; then the front sheet 24 and the back sheet 28 are respectively applied on the front encapsulation layer 22 and the rear encapsulation layer 26, thus forming A crystalline silicon solar cell module containing one or more cells. For the case where a crystalline silicon solar cell module contains multiple battery slices, each battery slice can be roughly coplanar arranged in a matrix. This point is easily understood by those skilled in the art. the

The front plate 24 may be constructed of a transparent glass plate, a polymer plate, etc., such as perfluoroethylene propylene (FEP), polyvinyl fluoride (ETFE), etc., in order to provide light transmission and required rigidity. The back plate 28 may be made of glass, polymer, metal, and a composite film of metal and polymer. the

The front encapsulation layer 22 and the rear encapsulation layer 26 may respectively be composed of polyvinyl acetate (EVA), polyvinyl butyral (PVB), ion copolymer, and the like. the

According to a preferred embodiment of the present application, the conductive glue is applied on the conductive tape, and then the conductive tape is applied to the battery sheet through the conductive glue. Conductive strips are usually cut from copper foil (a sheet of conductive material). Therefore, for the case where the conductive glue is applied on the conductive strip, the conductive glue can be applied on the copper foil (conductive material sheet) before cutting, or can be applied on the cut out conductive strip. the

It should be pointed out that the conductive tape is suitable for being attached to the front surface of the battery sheet on the first surface of the first longitudinal section thereof, and attached to the rear surface of the battery sheet on the opposite second surface of the second longitudinal section thereof. Therefore, Just make sure that there is conductive glue on the first surface of the first section of the conductive tape and the second surface of the second section. the

If it is necessary to apply a conductive glue on a copper foil (sheet of conductive material) before cutting, the copper foil has a first and a second section for producing a first and a second section of the conductive strip by cutting, it is only necessary to ensure that the copper foil It is sufficient to apply conductive glue on the first surface of the first section and the opposite second surface of the second section. the

However, due to technical reasons, the conductive adhesive may also be applied to other parts of the copper foil (conductive material sheet) or conductive tape, for example, on its complete two surfaces (for example, by dipping the conductive adhesive). Glue), the scope of this application covers these variations. the

According to another preferred embodiment of the present application, the conductive adhesive can be applied to the position of the battery sheet of the application where the conductive tape is expected to be attached, thereby forming a conductive adhesive strip on the battery sheet. The first conductive adhesive strip on the battery crosses the sub-grid lines of the battery sheet, so as to be electrically connected to each sub-grid line directly or through the main grid line, and the second conductive adhesive strip coated on the rear surface of the battery sheet is connected to the metal of the battery sheet. The electrical connection is established directly or through the main gate line. Then attach the conductive tape to the conductive adhesive strip. the

According to the present application, since the conductive tape is bonded to the battery sheet by means of a conductive adhesive layer, the front side busbars and rear side busbars usually made of expensive gold or silver in the prior art are completely or partially cancelled, Therefore, the cost of the cell sheet and the crystalline silicon solar cell module according to the present application can be reduced. the

In addition, since the Young's modulus and the processing temperature of the conductive adhesive are relatively low, it is not necessary to use a high-temperature thermocompression bonding tool to achieve welding between the conductive tape and the busbar as in the prior art. Therefore, thermal stress in the crystalline silicon cells can be completely or partially avoided, so that cracks and separations will not occur as in the prior art. the

In addition, since the soldering step is completely or partially eliminated, the conductive tape does not need to use lead-containing materials that are convenient for soldering, and therefore, lead pollution to the environment can be completely or partially avoided. the

Furthermore, the complete or partial elimination of the soldering step can lead to a simplification of the manufacturing process of the crystalline silicon solar cell module. the

Comparative Examples and Examples

The following describes the embodiment of the manufacturing method of the exemplary crystalline silicon solar cell module used in the present application and related comparative examples. the

First, some materials used in the examples and comparative examples of this application are introduced. the

Glass front: 3.2mm thick tempered glass, purchased from Dongguan CSG Solar Glass Co., Ltd., China;

EVA film: Revax ^™ 767 (Rui Fu 767) ethylene vinyl acetate (EVA) film (500 μm thick), obtained from Wenzhou Ruiyang Photovoltaic Materials Co., Ltd., China;

PTL 3HR 1000V背板，购于Krempel Group；  TPT backplane:

PTL 3HR 1000V backplane, purchased from Krempel Group;

Cell: 5-inch monocrystalline silicon solar cell blank (without electrodes), purchased from JA Solar Holdings Co., Ltd.;

PV16A银浆为前银，购于美国E.I.内穆尔杜邦公司(E.I.du Pont de Nemours and Company，下面简称“杜邦”)；  Front silver (used to form the main grid lines and auxiliary grid lines on the front side):

PV16A silver paste is pre-silver, purchased from EI du Pont de Nemours and Company (EIdu Pont de Nemours and Company, hereinafter referred to as "DuPont");

PV505银浆为背银，购于杜邦；  Back silver (used to form rear busbar):

PV505 silver paste is back silver, purchased from DuPont;

PV35C铝浆，购于杜邦；  Aluminum paste:

PV35C aluminum paste, purchased from DuPont;

Welding ribbon: P-XAP welding ribbon, purchased from Wuxi Sveck Technology Co., Ltd. the

The various embodiments and comparative examples of the present application are described in detail below. the

Comparative example 1

The crystalline silicon solar cell used in Comparative Example 1 has four busbars, two at the front and the rear of the crystalline silicon cell, which are prepared as follows. First, print the backside electrodes of the battery sheet. Print the back silver on the back of the cell as the back busbar, and dry it at 300°C. Then, print the aluminum paste to the back of the battery to cover other areas except the busbar, and dry it as well. Then, the front silver is printed on the front surface of the battery sheet with the main grid lines and the auxiliary grid lines at the same time, and dried. Finally, the printed cells were sintered at 890°C. the

The monolithic silicon solar cell module of Comparative Example 1 was prepared as follows. First, use a welding torch to weld four ribbons to the front and rear four busbars of the cell at 310°C to achieve electrical connection. Next, cover the front and rear encapsulation layers made of EVA film on the front side and the rear side of the electrically connected battery sheet. Next, cover the glass front plate and the TPT back plate on the front encapsulation layer and the rear encapsulation layer respectively. Finally, using a Meier Vakuumtechnick GMBG composite machine, the structure was vacuum composited for 15 minutes at 1atm and 145°C to finally form a monolithic silicon solar cell module. The battery module power was measured at 2.32 watts on a SIM 3500SLP solar simulator (available from Spire Corporation). the

Comparative example 2

The crystalline silicon solar cells used in Comparative Example 2 do not contain main grid lines, but only sub-grid lines and back aluminum, which are prepared as follows. First, print aluminum paste and cover the entire back of the crystalline silicon cell, and dry it at 300°C. Next, the front silver screen-printed sub-grids were applied to the front surface of the cell, and dried. The sub-grid runs through the entire cell. Finally, the printed cells were sintered at 890°C. the

The monolithic silicon solar cell module of Comparative Example 2 was prepared as follows. Firstly, four welding ribbons were respectively welded to the front and back surfaces of the battery sheet at 280° C. with welding torches. Wherein, the two front soldering strips run through all the secondary gate lines. Next, the front side and the back side of the welded battery sheet are covered with a front encapsulation layer and a rear encapsulation layer made of EVA film. Next, cover the glass front plate and the TPT back plate on the front encapsulation layer and the rear encapsulation layer respectively. Finally, a monolithic silicon solar cell module was prepared as in Comparative Example 1. The power of the battery module measured on the above solar simulator is 0 watts. the

Example 1

The crystalline silicon solar cells used in Example 1 and the cells of Comparative Example 2 have the same structure and are made by the same method. The monolithic silicon solar cell module of Example 1 was prepared as follows. the

First, 78 wt% of silver particles with a particle size of 2 to 8 microns and 0.5 wt% of tert-butylperoxycarbonate-2- Ethylhexyl ester (Tert-Butyl peroxy 2-ethylhexyl carbonate) is mixed with EVA obtained from E.I.du Pont de Nemours and Company (E.I.du Pont de Nemours and Company) under the trade name PV 1650 at a temperature of 90 to 100°C for about 10 minutes to make conductive adhesive material. the

Then, the resulting conductive paste was hot-pressed onto a 105-micron-thick copper foil at a temperature of 100° C., so that the conductive paste formed a 100-micron-thick film to be laminated with the copper foil. the

Next, the composite sheet thus formed was cut into conductive strips of 2 mm width. the

Next, the conductive tape is attached to the aluminum paste sintered layer on the front side and the rear side of the battery sheet with the aforementioned structure of the present application, and the conductive tape on the front surface is connected to the auxiliary grid line, thereby realizing the electrical connection of the battery sheet . Specifically, the conductive tape is attached to the front side surface of a battery sheet by means of conductive glue, and this section traverses each sub-grid line on the battery sheet and establishes a direct electrical connection with each sub-grid line; another conductive tape is attached to the The aluminum paste layer (metallization layer) on the rear side of the battery sheet is sintered and electrically connected to it. the

Next, cover the front and rear encapsulation layers made of EVA film on the front side and the rear side of the electrically connected battery sheet. the

Next, cover the glass front plate and the TPT back plate on the front encapsulation layer and the rear encapsulation layer respectively. Thereafter, using a Meier Vakuumtechnick GMBG composite machine, the five-layer structure was vacuum composited at 1atm and 145°C for 15 minutes to form the final monolithic silicon solar cell module. The power of the battery module was measured to be 2.29 watts on the solar simulator. the

Example 2

The crystalline silicon solar cell used in Example 2 and the cell of Comparative Example 2 have the same structure and are made by the same method. The monolithic silicon solar cell module of Example 2 was prepared as follows. First, CE 3013WLV epoxy conductive adhesive purchased from Henkel AG & Co. KGaA under the trade name Emerson & Cuming ^TM was used as the conductive adhesive material.

Then, this conductive paste was applied to a 2 mm wide copper foil as a conductive tape. the

Next, the conductive tape was attached to the battery sheet with the aforementioned structure of the present application in a manner similar to that described in Embodiment 1, so as to realize the electrical connection of the battery sheet. the

Next, cover the front and rear encapsulation layers, the front sheet and the back sheet on the electrically connected cell sheets as in Embodiment 1, thus completing the entire crystalline silicon solar cell module. In this crystalline silicon solar cell module, the power of the cell module was measured to be 2.31 watts. the

Comparative example 3

The crystalline silicon solar cell used in Comparative Example 3 has two front-side busbars and no rear-side busbars, which is prepared as follows. First, print the backside electrodes of the battery sheet. Print the back aluminum on the back of the cell as the rear electrode and dry it at 300°C. The back aluminum covers the entire back of the cell. Next, screen-print the front silver grid lines and sub-grid lines on the front surface of the battery sheet, and dry them. Finally, the printed cells were sintered at 890°C. the

Comparative Example 3 A monolithic silicon solar cell module was prepared as follows. First, use a welding torch to weld two ribbons to the two front busbars of the battery at 280°C, and at the same time, weld the other two ribbons to the aluminum paste sintered later. Next, the front side and the back side of the welded battery sheet are covered with a front encapsulation layer and a rear encapsulation layer made of EVA film. Next, cover the glass front plate and the TPT back plate on the front encapsulation layer and the rear encapsulation layer respectively. Finally, a monolithic silicon solar cell module was prepared as in Comparative Example 1. The power of the battery module was measured as 0 watts on the solar simulator. the

Example 3

The crystalline silicon solar cell used in Example 3 and the cell of Comparative Example 3 have the same structure and are made by the same method. The preparation of the monolithic silicon solar cell module in Example 3 is the same as in Example 1, except that the conductive tape on the front surface is pasted on the main grid line on the front surface of the crystalline silicon cell instead of penetrating through the auxiliary grid line. The resulting monolithic silicon solar cell module measured a power of 2.28 watts. the

Comparative example 4

The crystalline silicon solar cell used in Comparative Example 4 has two rear side busbars and no front side busbars, which is prepared as follows. First, print the backside electrodes of the battery sheet. Print the back silver on the back of the cell as the back busbar, and dry it at 300°C. Then, print the aluminum paste to the back of the battery to cover other areas except the busbar, and dry it as well. Next, screen-print the auxiliary grid lines on the front surface of the battery sheet with the front silver and dry them. The sub-grid runs through the entire cell. Finally, the printed cells are sintered at 890°C

The monolithic silicon solar cell module of Comparative Example 4 was prepared as follows. First, use a welding torch to respectively weld two solder ribbons to the front of the battery at 280°C, passing through the auxiliary grid. At the same time, solder the other two ribbons to the two main grid lines behind the crystalline silicon battery. Next, the front side and the back side of the welded battery sheet are covered with a front encapsulation layer and a rear encapsulation layer made of EVA film. Next, cover the glass front plate and the TPT back plate on the front encapsulation layer and the rear encapsulation layer respectively. Finally, a monolithic silicon solar cell module was prepared as in Comparative Example 1. The power of the battery module was measured to be 2.04 watts on the solar simulator. the

Example 4

The crystalline silicon solar cell used in Example 4 and the cell of Comparative Example 4 have the same structure and are made by the same method. The preparation of the monolithic silicon solar cell module in Example 4 is the same as in Example 1, except that the conductive tape on the back is pasted on the busbar on the back of the crystalline silicon cell. The resulting monolithic silicon solar cell module measured a power of 2.33 watts. the

Comparative Example 1 described above corresponds to the prior art, in which both the front and rear surfaces of the battery sheet have busbars, and solder ribbons are welded to the busbars. Therefore, Comparative Example 1 has the disadvantages discussed in the background art section above. the

The battery sheet of Comparative Example 2 does not have busbars on the front and rear surfaces, and the ribbon is directly welded to the battery sheet. In this case, the electric energy of the battery cannot be output. the

Similar to the battery sheet of Comparative Example 2, the front and rear surfaces of the battery sheet of Example 1 and Example 2 do not have busbars, but the conductive tape is connected to the battery sheet through conductive glue. The electric energy of the battery in these two examples Capable of being efficiently output, the power of the battery module is comparable to that of the prior art in Comparative Example 1. the

The battery sheet of Comparative Example 3 has front side busbars but does not have rear side busbars, and the ribbon is welded on the battery sheet. In this case, the electric energy of the battery cannot be output. the

Similar to the battery sheet of Comparative Example 3, the battery sheet of Example 3 also has front side busbars, but does not have rear side busbars, and the conductive tape is connected to the front side busbars and the back aluminum of the battery sheet through conductive glue. In addition, the electric energy of the battery can be effectively output, and the power of the battery module is equivalent to that of the prior art in Comparative Example 1. the

The battery sheet of Comparative Example 4 has rear busbars but does not have front busbars, and the ribbon is welded on the battery sheet. In this case, the electric energy of the battery cannot be fully output. the

Similar to the battery sheet of Comparative Example 4, the battery sheet of Example 4 also has rear side busbars, but does not have front side busbars, and the conductive tape is connected to the front surface of the battery sheet and the rear side busbars through conductive glue In addition, the electric energy of the battery can be effectively output, and the power of the battery module is equivalent to that of the prior art in Comparative Example 1. the

It can be seen that the present application completely or partially cancels the busbars of crystalline silicon solar cells, thereby eliminating or alleviating various problems existing in the prior art, and at the same time obtaining electric energy equivalent to that of the prior art output. the

While the present application has been shown and described with respect to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present application as defined in the claims. the

Claims (14)

1. A crystalline silicon solar cell module, characterized in that, comprising: A crystalline silicon solar cell having front and rear surfaces opposite to each other, one of the front and rear surfaces being a busbar-free surface, and the other of the front and rear surfaces being a busbar-lined surface or a busbar-free surface; and First and second conductive strips, wherein the first conductive strip is attached to the front surface of the crystalline silicon solar cell in a manner capable of collecting current by means of conductive glue, and the second conductive strip is attached in a manner capable of collecting current by means of conductive glue Attached to the rear surface of crystalline silicon solar cells. 2. The crystalline silicon solar cell module according to claim 1, characterized in that, the front surface of the crystalline silicon solar cell sheet is formed with a plurality of auxiliary grid lines parallel to and separated from each other for collecting current, and the first conductive A strap traverses these sub-gate lines and establishes electrical connection with them. 3. The crystalline silicon solar cell module according to claim 2, characterized in that, the front surface of the crystalline silicon solar cell sheet is a surface without busbar lines, and the first conductive strip is connected to the polycrystalline silicon solar cell through the conductive glue. The sub-gate lines are directly electrically connected. 4. The crystalline silicon solar cell module according to any one of claims 1 to 3, wherein the rear surface of the crystalline silicon solar cell is a busbar-free surface formed by a metallization layer, and the second The conductive strip is directly electrically connected to the metallization layer through the conductive glue. 5. The crystalline silicon solar cell module according to any one of claims 1 to 3, wherein the conductive glue is a conductive glue containing conductive particles. 6. The crystalline silicon solar cell module according to claim 5, wherein the conductive particles are particles made of gold, silver, nickel, copper, aluminum, zinc, tin, carbon nanotubes or graphene. 7. The crystalline silicon solar cell module according to any one of claims 1 to 3, wherein the conductive glue is made of conductive polymer material. the 8. The crystalline silicon solar cell module according to claim 7, wherein the conductive glue is made of polyacetylene conductive polymer material, polythiophene conductive polymer material, polypyrrole conductive polymer material or poly Conductive adhesive made of aniline conductive polymer material. 9. The crystalline silicon solar cell module according to claim 4, wherein the metallization layer is an aluminum paste sintered layer. 10. The crystalline silicon solar cell module according to any one of claims 1 to 3, wherein the first and second conductive strips are copper conductive strips. 11. The crystalline silicon solar cell module according to any one of claims 1 to 3, characterized in that it comprises at least two crystalline silicon solar cell sheets and at least one common conductor comprising a first segment and a second segment bring; Wherein, for two crystalline silicon solar cells adjacent to each other, the first section of the at least one common conductive strip constitutes a first conductive strip attached to the front surface of the first crystalline silicon solar cell, and the The second section of the at least one common conductive strip constitutes a second conductive strip attached to the rear surface of the second crystalline silicon solar cell. 12. The crystalline silicon solar cell module according to claim 11, wherein the first surface of the first section of the at least one common conductive strip is attached to the front surface of the first crystalline silicon solar cell, The opposite second surface of the second segment is attached to the rear surface of the second crystalline silicon solar cell. 13. The crystalline silicon solar cell module according to any one of claims 1 to 3, further comprising: a front encapsulation layer covering the front surface of the crystalline silicon solar cell; and The rear encapsulation layer covers the rear surface of the crystalline silicon solar cells. 14. The crystalline silicon solar cell module according to claim 13, further comprising: a front plate covering the front surface of the front encapsulation layer; and The backplane covers the rear surface of the rear packaging layer. the

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