CN203466193U - Solar cell module with plurality of serially-connected sub cells - Google Patents

Abstract

The utility model provides a solar cell module with a plurality of serially-connected sub cells, so as to solve the technical problem that the number of the sub cells is limited and the output voltage obtained in serial connection is limited. The adopted technical scheme is that substrate glass, a conductive layer, a photovoltaic absorption layer, and a back electrode layer are included in the structure layer. The key points are that the solar cell module comprises at least two rows of serially-connected sub cells, the conductive layers of the sub cells at ends of adjacent two rows are in end-to-end connection, and thus an S-shaped serially-connected sub cell module is formed.

Description

A kind of solar cell module of how sub-battery series connection

Technical field

The utility model relates to a kind of solar cell module, belongs to solar cell and manufactures field, particularly a kind of solar cell module of how sub-battery series connection.

Background technology

Along with making constant progress of the mankind, energy resource consumption is increasing, and traditional energy is constantly consumed rapidly.Solar energy is renewable cleaning new energy, and reserves are huge, from for a long time, most possibly substitutes traditional energy.And when utilizing solar cell power generation, the voltage of monoblock battery is difficult to do greatly, output current is larger, and the heat producing losses of battery itself and transfer wire is larger, and a large amount of energy consumes among transmission; And when being connected into photovoltaic array and generating electricity, the hot spot effect of sporadic part cell piece, will inevitably cause the situations such as adverse current heating, affects the generating gross efficiency of battery.

To make now the technological process of amorphous silicon solar cell module, describe, processing step is as follows:

------------P4 scribing is played a minor role, and------------bonding terminal box--emulation testing--is packed warehouse-in to autoclave to P3 laser scribing dorsum electrode layer to Sputter sputter back electrode to P2 laser scribing P-I-N layer to cleaning 2--PECVD deposition P-I-N layer to TCO base plate glass material loading in deburring in roll-in for superimposed PVB and back of the body glass to clean draw/convergent belt of 3--ultra-sonic welded to clean 1--P1 laser scribing tco layer.

According to above-mentioned technological process, we know, if there is no the impact of " drainage strip " and " busbar ", the sub-cell shapes of battery and interconnecting, is determined by path and the cooperation of mutual alignment relation of laser scribing P1, P2 and P3.

Be used at present maximum laser scribing carving methods, can make sub-battery with " long fillet " shape (see figure 1) that is together in series on the length of cell panel or Width one by one; Because the length and width of cell panel are limited, sub-battery can not be done again to obtain " too narrow ", the effects limit such as the width dimensions of laser scribing itself, positional precision the increase of sub-number of batteries, thereby limited the output voltage size of solar cell.

Summary of the invention

The technical problems to be solved in the utility model is: existing solar cell module is subject to the restriction of inside " sub-battery " syndeton---the sub-battery block of originally connecting with " long fillet " shape, even connect one by one along " narrow limit " in series connection direction, also can be subject to substrate overall length, fillet can not be too narrow, the restriction of the factors such as the width of laser scoring own and scribing positional precision---cause and can include the limited and limited technical problem of resulting output voltage of connecting of the sub-number of batteries of series connection in, designed solar cell module of a kind of how sub-battery series connection and preparation method thereof, by changing existing solar cell module delineation mode, solved in solar cell module, can seal in sub-battery and voltage limited, and the hot spot effect technical problem that can not be effectively controlled.

The utility model is that the technical scheme that realizes goal of the invention employing is: a kind of solar cell module of how sub-battery series connection, structure sheaf comprises base plate glass, conductive layer, photovoltaic absorption layer, dorsum electrode layer, key is: the structure of described solar cell module comprises at least two row's sub-series batteries, the conductive layer of the sub-battery of adjacent two row terminations joins end to end, and forms " snakelike " sub-series battery modules.

Key idea of the present utility model is: the utility model provides a kind of thinking, mainly finger can so that solar cell in limited area, be divided out more sub-battery, and make its effective arranged in series, thereby obtain the even more output voltage of high power of twice, three times; Under this high voltage, can realize with comparalive ease the electrical property advantage that high voltage just has; Solar battery sheet at limited area needs again in the more high-tension situation of output, recommend adoption; When being applied to cell power generation array, produce onesize high voltage, can obtain with the cell piece series connection of less amount, and simultaneously in order to obtain certain power, can select many Battery packs sheet in parallel to provide; Cell piece output voltage is high, and the magnitude of current of the battery of flowing through is little, and the caloric value of transmission line also can be little like this.

Utilize the utility model, if do not increase the making of high conductivity silver/aluminium thin layer before P1 scribing, just can on existing equipment and process basis, complete the making of solar cell CELL section, substantially do not need additionally to increase equipment or raw material; The mode of recommending is to increase high conductivity silver/aluminium thin layer, and the equipment of required increase and raw material are also few, can complete by little cost.

The utility model, in production technology, need be set up welding bypass diode and lead-out wire operation, but the welding of having saved busbar and drainage strip, technique is tending towards simplifying; Diode can be included in circuit more neatly, and choosing of its number, specification must be determined according to the concrete parameter attribute value of cell piece; Being connected into of diode can make monoblock battery have special performance, can resist better the problems such as hot spot effect.

When being applied to cell power generation array, produce onesize voltage, can obtain with the cell piece series connection of less amount, than conventional voltage battery sheet, need polylith series connection just can obtain the advantage that high voltage has syndeton; The photovoltaic array of the pure parallel connection of cell piece is therein during the unusual condition such as part cell piece generation hot spot effect, total peak output voltage can not change, and can be by sealing in the diode of output, the situation of protecting the impossible back current heating of whole electricity generation system, system effectiveness significantly to decay; And can by increase and decrease parallel-connected blocks/group number, control easily the output current of photovoltaic array; And simultaneously in order to obtain certain power, can select flexibly cell parallel.

The utility model is in solar cell and photovoltaic power generation array field, all designed a new form, in the variation of battery, the aspects such as lifting of photovoltaic array circuit optimization, the lifting of generating voltage reliability, power transmission line thermal losses, generated energy service efficiency, all have its special advantage.

Below in conjunction with accompanying drawing, the utility model is elaborated.

Accompanying drawing explanation

Fig. 1 is existing solar cell modular structure.

Fig. 2 is the structural representation of solar cell module in the utility model.

Fig. 3 sets up the equivalent circuit diagram after bypass diode in the sub-series battery modules in Fig. 2.

In accompanying drawing, the 1st, base plate glass, the 2nd, conductive layer, the 3rd, photovoltaic absorption layer, the 4th, dorsum electrode layer, the 5th, the sub-battery of adjacent two row terminations, D1, D2 represent bypass diode, in Fig. 2, arrow represents the current trend of solar cell module.

Embodiment:

Referring to Fig. 2, a kind of solar cell module of how sub-battery series connection, structure sheaf comprises base plate glass 1, conductive layer 2, photovoltaic absorption layer 3, dorsum electrode layer 4, its key is: the structure of described solar cell module comprises at least two row's sub-series batteries, the conductive layer 2 of the sub-battery 5 of adjacent two row terminations joins end to end, and forms " snakelike " sub-series battery modules.

Sub-cell shapes in described solar cell module is rectangle or square or triangle or hexagon.

Between the conductive layer 2 of sub-battery 5 of described adjacent two row terminations and photovoltaic absorption layer, be equipped with high conductivity silver/aluminium thin layer, the conductance of described silver/copper/aluminium thin layer respectively: silver is 0.0159(Ω mm ²/ m), copper is 0.0167(Ω mm ²/ m), aluminium is 0.02635(Ω mm ²/ m).

Between the circuit of the adjacent row in interval or sub-series battery more than a row, set up bypass diode D1, D2.

The utility model is to manufacture field at solar cell, by planning again and design to laser scribing process, processes a kind of solar cell of novel sub-battery-arrangements structure.The object of this arrangement architecture is to build to have the solar panel that how sub-battery is connected in series: for example, on cell panel, all sub-batteries can be together in series by certain path; Or partly parallel connection is then together in series by group again in groups according to certain rules; Sub-number of battery cells is more, and the radix that can Gong be connected in series is also larger.The feature of this new structure battery is: output voltage is high, output current is little; Cell piece at limited area need to be exported recommend adoption in more high-tension situation; When being applied to cell power generation array, can obtain required high voltage with cell piece series connection still less, than conventional batteries sheet, there is the advantage of syndeton; Electric current is little, and the caloric value of transmission line also can be less.

The utility model is the solar cell of a kind of novel sub-battery-arrangements structure of design; By this design, for the solar battery sheet of same area, can realize more " sub-battery " or " sub-battery pack " series connection of more number; This series connection, is not only original series connection in cell panel " length " direction, and can in cell panel " width " direction, add up to add series connection.

The redesign of laser scribing process in the utility model is not unalterable or require harsh scribing track, but can have a variety of tracks, pattern; As long as can realize " circuit cooperation " for tco layer, battery layers and dorsum electrode layer in technical process, just can realize the series connection of the sub-battery of the various shapes of this solar cell or the number to a greater extent of sub-battery pack.In view of the diversity of above-mentioned scribing track, this patent is only described " square " sub-battery example of connecting in detail at this; Can be extended out, the sub-cell shapes of other series connection shape can be equilateral triangle, regular hexagon etc., at this, provides reference.

In the utility model, how sub-battery cascaded structure can be applicable for the solar cell of nearly all " " structure; Be not only applicable to the single-unit solar cells such as " amorphous silicon ", " microcrystal silicon ", " cadmium telluride ", and be applicable to the double-junction solar batteries such as " amorphous-crystallite " " amorphous germanium silicon ", even compound multijunction solar cell; As long as the corresponding relationship consistency of front electrode, back electrode and battery layers, just goes for the application that how sub-battery is connected.

Summing up the processing step of realizing of the present utility model comprises:

A. depositing conducting layer 2 on base plate glass 1;

B.P1 laser scribing and cutting: laser along base plate glass 1 laterally with longitudinal cross-cut tco layer 2, tco layer 2 after cutting forms by lateral trench and longitudinal groove the independent conductive module being arranged in order, and the front electrodes conduct bar that independent conductive module is end to end, formation " snakelike " is arranged of adjacent two row terminations;

C. in the independent conductive module relevant positions of adjacent two row terminations, add high conductivity silver/copper/aluminium thin layer, this adds operation and can deposit or tinsel paster is realized by PVD;

D. depositing photovoltaic absorbed layer 3 on the TCO conductive layer 2 after P1 laser scribing and cutting;

E.P2 laser scribing and cutting: the laser rays of cutting photovoltaic absorption layer is parallel with the center line of the longitudinal groove forming after P1 laser cutting, and the center line of the odd-numbered line preformed groove of formation after cutting and even number line preformed groove difference simultaneous bias longitudinal groove;

F. on the photovoltaic absorption layer 3 through P2 laser scribing and after cutting, deposit dorsum electrode layer 4;

G.P3 laser scribing and cutting: P3 laser respectively along being parallel to the lateral trench that forms after P1 cutting, direction cutting dorsum electrode layer 4 and the photovoltaic absorption layer 3 of the preformed groove forming after P2 cutting, the sub-battery modules that formation " snakelike " is connected;

In described step e: odd-numbered line preformed groove is the center line of simultaneous bias longitudinal groove to the right, even number line preformed groove is the center line of simultaneous bias longitudinal groove left.

Claims (4)

1. the solar cell module that more than a kind, sub-battery is connected, structure sheaf comprises base plate glass (1), conductive layer (2), photovoltaic absorption layer (3), dorsum electrode layer (4), it is characterized in that: the structure of described solar cell module comprises at least two row's sub-series batteries, the conductive layer (2) of the sub-battery (5) of adjacent two row terminations joins end to end, and forms " snakelike " sub-series battery modules.

2. the solar cell module of a kind of how sub-battery series connection according to claim 1, is characterized in that: the sub-cell shapes in described solar cell module is rectangle or square or triangle or hexagon.

3. the solar cell module that a kind of how sub-battery according to claim 1 is connected, it is characterized in that: between the conductive layer (2) of sub-battery (5) of described adjacent two row terminations and photovoltaic absorption layer, be equipped with high conductivity silver/aluminium thin layer, the conductance of described silver/copper/aluminium thin layer respectively: silver is 0.0159(Ω mm ²/ m), copper is 0.0167(Ω mm ²/ m), aluminium is 0.02635(Ω mm ²/ m).

4. the solar cell module of a kind of how sub-battery series connection according to claim 1, is characterized in that: between the circuit of the adjacent row in interval and above sub-series battery, set up bypass diode (D1, D2).

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