CN207353269U - Back electrode type solar battery cell with distribution piece - Google Patents

Abstract

The utility model provides a kind of back electrode type solar battery cell with distribution piece, and the distribution for being arranged on distribution on piece is the substantially comb shape for having multiple comb sections, and the width of the root of comb section is wider than the width of the front end of comb section.According to the utility model, using the teaching of the invention it is possible to provide make transfer efficiency upward construction while the connection for ensuring the stabilization between back electrode type solar battery cell and distribution piece.

Description

Back electrode type solar battery cell with distribution piece

Technical field

It the utility model is related to the back electrode type solar battery cell with distribution piece.

Background technology

In recent years, it is continuously improved for the attention rate of global environmental problems, it is standby using the new energy technology of natural energy resources It is concerned.As one of them, the attention rate using the system of solar energy is high, turns luminous energy in particular with opto-electronic conversion effect The solar power generation for being changed to electric energy is widely used as the means for obtaining clean energy resource.

On solar cell device, although in the presence of the element using compound semiconductor or having used the member of organic material The various elements such as part, but at present, mainstream is the solar battery cell for using silicon crystal.

At present, the most solar battery cells for manufacturing and selling are with the double-face electrode type solar energy such as lower structure Battery unit：Formed with n-electrode on the face (smooth surface) of the side of sunlight incidence, in the face of side opposite with the smooth surface (back of the body Face) on formed with p-electrode.In addition, electrode is not formed on the smooth surface of solar battery cell, only in solar battery cell Back electrode type solar battery cell of the back side formed with n-electrode and p-electrode also developed.

For example, the back electrode type solar battery cell with distribution piece is disclosed in patent document 1.In patent document Have disclosed in 1 has the back electrode type solar battery cell with distribution piece as follows：Use overleaf electrode type solar cell The fixing resin set between the electrode of unit with least one party of the wiring closet of distribution piece, makes back electrode type solar cell list Member is bonded with distribution piece.In addition, disclose including cure fixing resin and technique as the first solid state, make it is first solid The technique and the fixing resin of softening is cured and fixing resin is become second and cure shape that the fixing resin of change state softens The back electrode type solar battery cell with distribution piece of the technique of state.By being disclosed in the utility model of patent document 1, energy Enough improve the stability of solar battery cell and the mechanical connection of distribution piece, and the stability of electrical connection can be improved.

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2012-99569 publications

Utility model content

Utility model problem to be solved

But do not disclose in patent document 1 on improving the back electrode type solar battery cell with distribution piece Transfer efficiency detailed content.

It is required that ensure to make transfer efficiency while back electrode type solar battery cell and the connection of the stabilization of distribution piece The construction of raising.

Means for solving the problems

The back electrode type solar battery cell with distribution piece of the utility model, it is characterised in that distribution piece has Insulating properties matrix material and insulating properties matrix material light receiving side set distribution, back electrode type solar battery cell The electrode that sets of rear side with silicon substrate and in silicon substrate, distribution is the substantially comb shape with multiple comb sections, the root of comb section The width in portion is wider than the width of the front end of comb section.

Utility model effect

According to the utility model, using the teaching of the invention it is possible to provide ensure the stabilization between back electrode type solar battery cell and distribution piece Connection while make the upward construction of transfer efficiency.

Brief description of the drawings

Fig. 1 shows the first embodiment of the utility model, is to show the back electrode type solar cell with distribution piece The schematic diagram of unit.

Fig. 2 (a)-Fig. 2 (b) shows the first embodiment of the utility model, is back electrode type solar battery cell Schematic diagram.

Fig. 3 (a)-Fig. 3 (b) shows the first embodiment of the utility model, is the schematic diagram of distribution piece.

Fig. 4 shows the first embodiment of the utility model, is the enlarged diagram for the distribution for showing distribution piece.

Fig. 5 (a)-Fig. 5 (g) shows the first embodiment of the utility model, is to show back electrode type solar cell The schematic diagram of the manufacture method of unit.

Fig. 6 (a)-Fig. 6 (h) shows the first embodiment of the utility model, is to show back electrode type solar cell The schematic diagram of unit and the joint method of distribution piece.

Fig. 7 shows the second embodiment of the utility model, is the schematic diagram for the distribution for showing distribution piece.

Fig. 8 shows the 3rd embodiment of the utility model, is the schematic diagram for the distribution for showing distribution piece.

Fig. 9 shows the 4th embodiment of the utility model, is the schematic diagram for the distribution for showing distribution piece.

Figure 10 (a)-Figure 10 (b) shows the 5th embodiment of the utility model, is the signal for the distribution for showing distribution piece Figure.

Figure 11 shows the 6th embodiment of the utility model, is the schematic diagram for the distribution for showing distribution piece.

Embodiment

Hereinafter, the embodiment of the utility model is illustrated referring to the drawings.

[embodiment 1]

The back electrode type solar battery cell with distribution piece of embodiment 1 is described as follows referring to the drawings. Fig. 1 is the figure of the back electrode type solar battery cell with distribution piece of the present embodiment from light receiving side.Band is matched somebody with somebody The back electrode type solar battery cell 100 of line piece be back electrode type solar battery cell 2 is positioned in distribution piece 1 and Formed.Back electrode type solar battery cell 2, which has, to be constructed as below：With the N-shaped of the substantially comb shape on distribution piece 1 with matching somebody with somebody Line, p-type are used with N-shaped electrode, p-type electrode, N-shaped distribution is respectively correspondingly placed with the corresponding position of distribution with N-shaped Electrode is electrically connected, and p-type is electrically connected with distribution with p types with electrode.In the present embodiment, distribution passes through attachment with electrode Connection.

Fig. 2 (a)-Fig. 2 (b) is the figure for the back electrode type solar battery cell for schematically illustrating present embodiment.Fig. 2 (a) be the A-A ' sections for showing the back electrode type solar battery cell in Fig. 1 figure, Fig. 2 (b) is observed from rear side Schematic diagram during back electrode type solar battery cell.The back side in the application is and back electrode type solar battery cell The opposite face of smooth surface.

As shown in Fig. 2 (a), overleaf the silicon substrate 21 with concaveconvex shape of electrode type solar battery cell 2 by Light side formed with antireflection film 22, silicon substrate 21 rear side formed with passivating film 25.As silicon substrate 21, for example, can Use the substrate being made of the polysilicon with any one conductivity type in N-shaped or p-type or monocrystalline silicon etc..As silicon substrate 21 Thickness, be preferably less than more than 50 μm 400 μm Zuo You.As antireflection film 22, using the film being made of silicon nitride, as blunt Change film 25, use the film being made of silica.This is not limited to above.As passivating film 25, for example, nitridation can also be used Layered product of silicon fiml or silicon oxide film and silicon nitride film etc..

In addition, the inside of silicon substrate 21 rear side formed with：P-type impurity diffusion zone 23, it is miscellaneous to be diffused with the N-shapeds such as phosphorus Matter；And n-type impurity diffusion zone 24, it is diffused with the n-type impurities such as boron.P-type impurity diffusion zone 23 is to include the p-type impurities such as phosphorus Region.N-type impurity diffusion zone 24 is the region for including the n-type impurities such as boron or aluminium.

In the inside with N-shaped or the silicon substrate 21 of the conductivity type of p-type, expand in p-type impurity diffusion zone 23 or n-type impurity Region 24 is dissipated with being tied on the interface of silicon substrate 21 formed with multiple pn.Thus, via the contact hole being arranged on passivating film 25, With the N-shaped that p-type impurity diffusion zone 23 is connected with electrode 26 and with the p-type that n-type impurity diffusion zone 24 is connected electrode 27 Respectively become and be formed in the corresponding electrode of multiple pn-junctions of the rear side of the inside of silicon substrate 21.As N-shaped electrode 26 and p-type electrode 27, for example, the electrode being made of metals such as silver can be used.

As shown in Fig. 2 (b), N-shaped possesses having of being formed at predetermined spaced intervals with electrode 26 and p-type respectively with electrode 27 Multiple rectangular portions of length direction.N-shaped with the rectangular portion of electrode 26 and the rectangular portion of p-type electrode 27 respectively with rectangular portion The orthogonal direction of length direction on, alternately configure at predetermined spaced intervals.N-shaped electrode 26 and the square of p-type electrode 27 The width and spacing in shape portion are all approximately fixed.The width means of the rectangular portion direction orthogonal with the length direction of electrode, i.e. short side The length in direction.The spacing of rectangular portion represent the midpoint of the short side direction of electrode and the short side direction of adjacent electrode midpoint it Between distance.

In addition, N-shaped can also have with electrode, p-type with electrode is divided into multiple shapes in the longitudinal direction.

Fig. 3 (a)-Fig. 3 (b) is the schematic diagram of the distribution piece of present embodiment.Fig. 3 (a) is the figure from light receiving side, Fig. 3 (b) is the figure in the B-B ' sections for representing Fig. 3 (a).

Distribution piece 1 is by insulating properties matrix material 11 and the distribution 16 being formed on a surface of insulating properties matrix material 11 Form.As insulating properties matrix material 11, such as use PET.It is in addition, conductive as distribution 16, such as using copper etc. Material.In the present embodiment, the insulating properties matrix materials'use as distribution piece is used as master using the PET of 75 μm or so of thickness The resin sheet of component, the copper wiring of about 35 μm of thickness is used as distribution.The principal component of resin sheet is not limited to PET, also may be used To use PEN etc..

4 rows 4 are configured on the distribution piece 1 of Fig. 3 (a)-Fig. 3 (b) and arrange totally 16 back electrode type solar battery cells, structure Into the back electrode type solar battery cell with distribution piece.Pass through the distribution on distribution piece 1,16 back electrode type solar energy Battery unit is connected electrically in series.For example, back electrode type solar cell of the configuration on the region C on distribution piece 1 The n types electrode of unit, p-type electrode respectively be present in the N-shaped distribution 12 of region C, p-type distribution 13 electrically and Physically connect.

N-shaped has the shape of substantially comb shape with distribution 12 and p-type distribution 13 respectively, equivalent to broach part have every Open the shape for multiple isosceles triangles that predetermined interval is formed.The N-shaped isosceles triangle equivalent to broach of distribution 12 Part and p-type with the part of the isosceles triangle equivalent to broach of distribution 13 respectively with the length direction of isosceles triangle just On the direction of friendship, alternately configure at predetermined spaced intervals.The direction orthogonal with the length direction of isosceles triangle is the bottom of equivalent to Edge direction.

Connection is with distribution 14a and 14b in the length direction with N-shaped distribution 12 and the isosceles triangle of p-type distribution 13 Orthogonal side upwardly extends, N-shaped with the isosceles triangle part of distribution 12 and p-type distribution 13 be connected with distribution 14a or 14b connections.

The p-type of the region C of distribution piece 1 is connected with distribution 13 with p-type extraction with distribution 13a.In addition, the N-shaped of region C is with matching somebody with somebody P-type distribution and connection distribution 14a connection of the line 12 via region D.In other words, the adjacent back of the body configured in a column direction Face electrode type solar battery cell is electrically and physically connected via the connection on distribution piece 1 with distribution 14a each other.Separately Outside, the back electrode type solar battery cell configured in line direction is electrically connected via connection distribution 14b each other.As above institute State, 16 back electrode type solar battery cells are connected electrically in series, and the electric current produced by opto-electronic conversion is respectively from p Type is drawn to be drawn with distribution 13a, N-shaped and is taken out with distribution 12a.In addition, respectively positioned at the N-shaped distribution 12a of the end of distribution piece 1 It is electrically connected with p types with the adjacent N-shaped beyond distribution 13a with distribution 12 and p-type with distribution 13 by connection with distribution 14a or 14b Connect.In addition, connection is arranged on the outside for the part for being placed with back electrode type solar battery cell with distribution 14b.

Fig. 4 is the figure for the E parts being exaggerated in Fig. 3 (a).The distribution of substantially pectination on distribution piece 1 substantially has isosceles The shape of triangle.Root equivalent to the base of the isosceles triangle of each distribution is physically contacted with connection with distribution 14a, phase When the front end on the vertex of the isosceles triangle in distribution is not physically contacted with being connected with distribution 14a.By the width for making root It is bigger than the width L2 of front end to spend L1, so as to improve the output work of the back electrode type solar battery cell with distribution piece Rate.This is because the resistance of the length direction of distribution can be reduced.

The reasons why being improved for output power, is further described as follows.

When applying heat to the back electrode type solar battery cell with distribution piece, by the insulation for forming distribution piece 1 Property silicon substrate 21 of the basis material 11 with forming back electrode type solar battery cell 2 thermal coefficient of expansion difference, there are original The situation of the position offset of the distribution and electrode on opposite position should be configured.Due to position offset, p-type distribution It is close with N-shaped electrode or N-shaped distribution and p-type electrode.Thus, existing causes inter-electrode short-circuit, the back of the body with distribution piece The situation that the output power of face electrode type solar battery cell reduces.The output work as caused by this position offset in order to prevent The reduction of rate, preferably wiring closet have the distance more than certain.Also the asking there are Ion transfer when the distance of wiring closet is narrow Topic.Specifically, 50 μm~about 300 μm are preferably from about.Applied as to the back electrode type solar battery cell with distribution piece The example of the situation of heating, can enumerate the sealing technology for the heating for carrying out about 160 degree.

In the present embodiment, the spacing of distribution is about 750 μm.In addition, the height of triangle is about 160mm, triangle Short transverse on substantially central portion in width be about 650 μm.

With the substantially rectangular shape of back electrode type solar battery cell.The width of substantially rectangular short side direction is big Cause to fix.By being configured to substantially rectangular shape, stable high-output power can be obtained.This is because the shape is to hold Easily form the shape of correct electrode pattern.

In the present embodiment, although the shape of opposite electrode is different from the shape of distribution, will not produce by shape The output of the back electrode type solar battery cell with distribution piece reduces caused by shape is different.Give reasons below.

On the back electrode type solar battery cell with distribution piece, the electricity on the distribution and backplate of distribution on piece Pole is configured in opposite position.In the electrode for being arranged at back electrode type solar battery cell, in solar battery cell Most of electronics that inside produces stays the electrode to underface, further towards the distribution of underface.Thus, overleaf electrode type In solar battery cell, current density hardly changes since the position of substantially rectangular electrode is different.On the contrary, with In the distribution of line piece, current density becomes larger from front end to root.Thus, even if the width of the rectangular portion of electrode is substantially solid Calmly, the construction that the width of the rectangular portion of distribution becomes larger to root, will not produce the problem of resistance loss becomes larger.Thus, i.e., It is substantially rectangular shape to make electrode, and the output power of back electrode type solar battery cell will not reduce.

Hereinafter, the manufacture method of the backplate solar battery cell with distribution piece of present embodiment is shown.

Fig. 5 (a)-Fig. 5 (g) is the back electrode type sun for showing the present embodiment shown in Fig. 1 and Fig. 2 (a)-Fig. 2 (b) The sectional view of the signal of an example of the manufacture method of energy battery unit.The back side using Fig. 5 (a)-Fig. 5 (g) to present embodiment An example of the manufacture method of electrode type solar battery cell illustrates.

First, as shown in Fig. 5 (a), silicon substrate 21 is prepared first.Due to being cut into slices from ingot casting, in silicon substrate 21 21a is lost formed with section on surface.

Then, as shown in Fig. 5 (b), the section loss 21a on the surface of silicon substrate 21 is removed.Herein, it is lost on section The removal of 21a, being capable of alkaline aqueous solution etc. pair such as the mixed acid or sodium hydroxide by aqueous hydrogen fluoride solution and nitric acid The surface of silicon substrate 21 after above-mentioned section is etched to carry out.

Then, as shown in Fig. 5 (c), p-type impurity diffusion zone 23 and n-type impurity are formed respectively at the back side of silicon substrate 21 Diffusion zone 24.On p-type impurity diffusion zone 23, such as can be miscellaneous as N-shaped as POCl3 by using including The gas phase diffusion of the gas of the phosphorus of matter is formed.On n-type impurity diffusion zone 24, such as can be by using comprising such as The methods of gas phase diffusion of the gas of the such boron as n-type impurity of BBr3, is formed.

Then, as shown in Fig. 5 (d), passivating film 25 is formed at the back side of silicon substrate 21.Herein, on passivating film 25, example Such as, thermal oxidation method or plasma CVD (Chemical Vapor Deposition can be passed through：Chemical vapor deposition) side such as method Method is formed.

Then, as shown in Fig. 5 (e), when the concavo-convex structure such as formation texture structure in the entire surface in the smooth surface of silicon substrate 21 After making, antireflection film 22 is formed on the sag and swell.On texture structure, for example, can use will be in sodium hydroxide or hydrogen The liquid that with the addition of isopropanol in the alkaline aqueous solution of potassium oxide etc. is heated to such as less than more than 70 DEG C 80 DEG C of etching solution The smooth surface of silicon substrate 21 is etched and is formed.Antireflection film 22 such as can by plasma CVD method formed.

Then, as shown in Fig. 5 (f), a part for the passivating film 25 at the back side by removing silicon substrate 21 contacts to be formed Hole 25a and contact hole 25b.Herein, contact hole 25a is formed as, and makes at least a portion on the surface of p-type impurity diffusion zone 23 Expose, contact hole 25b is formed as, and at least a portion on the surface in p type impurity diffusions region 24 is exposed.

In addition, contact hole 25a and 25b can be formed by the following method respectively：For example, will be using photoetching technique After corrosion-resisting pattern of the part corresponding with the position of formation contact hole with opening is formed on passivating film 25, pass through etching etc. Passivating film 25 is removed from the opening of corrosion-resisting pattern.

Then, as shown in Fig. 5 (g), by carrying out silk-screen printing to silver, so as to form N-shaped with electrode 26 and p-type electrode 27.N-shaped electrode 26 is contacted by contact hole 25a with p-type impurity diffusion zone 23, p-type with electrode 27 by contact hole 25b with N-type impurity diffusion zone 24 contacts.It is substantially rectangular by forming electrode, so as to be difficult to cause obscuring for silk-screen printing Deng making electrode forming process more stable.

In addition, using Fig. 6 (a)-Fig. 6 (h) to the back electrode type solar battery cell and distribution piece of present embodiment Stickup illustrate.

First, as shown in Fig. 6 (a), preparation is included on the back side of silicon substrate 21 at predetermined spaced intervals and the N-shaped of setting With electrode 26 and the back electrode type solar battery cell 2 of p-type electrode 27.Herein, for convenience of description, only illustrate respectively One N-shaped electrode 26 and p-type electrode 27, but can certainly be have respectively it is multiple.

Then, as shown in Fig. 6 (b), overleaf the N-shaped at the back side of the silicon substrate 21 of electrode type solar battery cell 2 is used Electrode 26 and p-type between electrode 27, setting uncured fixing resin 31a respectively.Fixing resin fixes back electrode type too Positive energy battery unit and distribution piece.

As the method to set up of fixing resin 31a, applied for example, silk-screen printing, distributor coating or ink jet type can be enumerated The methods of cloth.Wherein, preferably using silk-screen printing.Fixing resin 31a simply can be set in low cost and short time.

The width of fixing resin 31a at 21 side of silicon substrate of back electrode type solar battery cell 2 be preferably not with n The width that type is contacted with electrode 26 and p-type electrode 27.This is because it can expect back electrode type solar battery cell 2 Electrode and the distribution of distribution piece 1 between the stability being electrically connected raising.

In addition, in the present embodiment, although setting fixed tree the electrode of back electrode type solar battery cell 2 The situation of fat 31a is illustrated, but can also set fixing resin 31a in the wiring closet of distribution piece 1, can also carry on the back Wiring closet between the electrode of face electrode type solar battery cell 2 with distribution piece 1 sets fixing resin 31a respectively.

On the shape of fixing resin 31a, although being preferably the n respectively along back electrode type solar battery cell 2 The wire of type electrode 26 and p-type electrode 27, but it is described later be directed to sealing material in sealing technology in, as long as with Set the fixing resin of the first solid state to soften and be capable of the gap of abundant degree of expansion between electrode, then can also be to be interrupted The shape of ground configuration.

As fixing resin 31a, preferably using that can realize the resin of B-stage.The resin that can realize B-stage is Following resin：When the uncured fixing resin 31a to liquid condition is heated, viscosity rises and becomes and cure shape Viscosity is reduced and softened after state (the first solid state), and viscosity rises again afterwards and (second cures shape as solid state State).

Then, as shown in the sectional view of the signal of Fig. 6 (c), cure uncured fixing resin 31a and become first The fixing resin 31b of solid state.For uncured fixing resin 31a, for example, the light by heating and/or ultraviolet etc. Irradiation etc. become the first solid state to cure.Thus, compared with the state of uncured fixing resin 31a, can obtain The fixing resin 31b of the first solid state reduced to bonding force and mobility.

In addition, the fixing resin 31b of the first solid state is preferably, compared with its uncured state under room temperature (about 25 DEG C) Viscosity is high, has shape retention (as long as not applying external force then indeformable property), and (have i.e. for the low state of caking property Back electrode type solar battery cell 2 and distribution piece 1 is set to touch the surface of fixing resin 31b, fixing resin 31b The state of the caking property of back electrode type solar battery cell 2 and distribution piece degree will not be attached to).At this time, after setting In the technique for the attachment stated, the high typography of productivity can be used.Moreover, make the back electrode type sun described later Can in the technique overlapping with distribution piece 1 of battery unit 2, by back electrode type solar battery cell 2 it is overlapping with distribution piece 1 it Afterwards, there is also the tendency that easily can be removed back electrode type solar battery cell 2 and distribution piece 1.Accordingly, there exist can Easily and highly accurately carry out the electrode and the tendency of the positioning of the distribution of distribution piece 1 of back electrode type solar battery cell 2.

The fixing resin 31a of its uncured state is set to become the first fixing resin 31b of the first solid state by heating When, become the temperature of the first fixing resin 31b of the first solid state, preferably first than the first solid state described later is fixed The temperature that the temperature of resin 31b softenings and the first fixing resin 31c of soft state become the second solid state is low.Thus, lead to Cross and heating-up temperature is controlled, so as to prevent the fixing resin 31a of its uncured state from proceeding to soft state or second Solid state.

Then, as shown in the sectional view of the signal of Fig. 6 (d), the overleaf N-shaped electricity consumption of electrode type solar battery cell 2 Pole 26 and p-type setting attachment 32 on 27 respective surface of electrode.As attachment 32, can use for example comprising The material of the conductive materials such as solder.On attachment 32, such as silk-screen printing, distributor coating or ink jet type can be passed through The methods of coating, is set.Wherein, preferably using silk-screen printing.This is because can be simply with low cost and short time Attachment 32 are set.

In addition, in the present embodiment, although being connect to overleaf being set on the electrode of electrode type solar battery cell 2 The situation for closing component 32 is illustrated, but attachment 32 can be set on the distribution of distribution piece, can also be overleaf Attachment 32 are set respectively on the electrode of electrode type solar battery cell 2 and on the distribution of distribution piece.Furthermore it is possible to will not Fixing resin 31a and 32 both sides of attachment are arranged on back electrode type solar battery cell 2 or distribution piece 1, for example, Fixing resin 31a can be overleaf set between the electrode of electrode type solar battery cell 2, sets and connects on the distribution of distribution piece Close component 32.

Then, as shown in Fig. 6 (e), overlapping back face electrode type solar battery cell 2 and distribution piece 1.Back electrode type is too Positive energy battery unit 2 is overlapping with distribution piece 1, is N-shaped electrode 26 and the p-type for making back electrode type solar battery cell 2 With electrode 27 respectively across attachment 32 and the N-shaped that is arranged on the insulating properties matrix material 11 of distribution piece 1 distribution 12 and P-type is carried out relatively with distribution 13.

Then, by pressurizeing to overlapping back electrode type solar battery cell 2 and distribution piece 1 as described above Heating and/or irradiation light make the back electrode type solar battery cell with distribution piece at the same time.

Herein, as shown in the sectional view of the signal of Fig. 6 (f), the fixing resin 31b on the first solid state passes through heating And/or the light of ultraviolet etc. irradiation and viscosity reduces and softens, become the fixing resin 32c of soft state.

Also, as shown in the sectional view of the signal of Fig. 6 (g), between the electrode of back electrode type solar battery cell 2 The fixing resin 31c of soft state become by the pressurization between back electrode type solar battery cell 2 and distribution piece 1 Shape, enters the wiring closet of distribution piece 1.In addition, the conductive material in attachment 32 is melted also by heating, pass through the back of the body Pressurization between face electrode type solar battery cell 2 and distribution piece 1 and the overleaf electrode of electrode type solar battery cell 2 Deformed between the distribution of distribution piece 1.

Afterwards, as shown in the sectional view of the signal of Fig. 6 (h), the fixing resin 31c of soft state further passes through heating And/or the light of ultraviolet etc. irradiation and viscosity rise and cure again, become the fixing resin 31d of the second solid state.The Two solid states are the curing of the cross-linking reaction based on resin, therefore the fixing resin 31d of the second solid state will not be soft again Change and it is in stable condition.That is, back electrode type solar battery cell 2 can firmly be engaged with distribution piece 1.

Afterwards, from light receiving side configuration translucent matrix material, sealing resin, the back electrode type solar energy with distribution piece Battery unit, sealing resin, rear side protection materials, are sealed by being heated and being pressurizeed.As translucent matrix material Use glass.In addition, use EVA (ethylene vinyl acetate resin) as sealing resin.EVA is not necessarily limited to, such as also may be used With the resin arranged using olefin-based.

Back electrode type solar battery cell with distribution piece has p-type extraction distribution and the extraction of n types distribution point It is not electrically connected with terminal box.In addition, the sidepiece as the back electrode type solar battery cell with distribution piece in sealing is embedding Enter frame and there is the construction of high intensity.

[embodiment 2]

The back electrode type solar battery cell with distribution piece of embodiment 2 is described as follows referring to the drawings. The points different from embodiment 1 are, the N-shaped electrode of distribution on piece and the shape of p-type electrode are not triangles but terraced Shape.

Fig. 7 shows a part for the distribution piece of present embodiment.Equivalent to the Fig. 3 used in the explanation of embodiment 1 (a) enlarged drawing of the E parts in.N-shaped distribution 121 has by multiple trapezoidal shapes formed.P-type with distribution 131 similarly, With by multiple trapezoidal shapes formed.When in the wiring there are during acute angle portion, although in the presence of the thin portion of the width in distribution Position causes the possibility of broken string, but can accurately suppress to break by eliminating acute angle portion.

[embodiment 3]

The back electrode type solar battery cell with distribution piece of embodiment 3 is described as follows referring to the drawings. The points different from embodiment 2 are, the shape of the connection distribution of distribution on piece.

Fig. 8 shows a part for the distribution piece of present embodiment.Equivalent to the Fig. 3 used in the explanation of embodiment 1 (a) enlarged drawing of the E parts in.N-shaped distribution 122 and p-type distribution 132 all have by multiple generally trapezoidal portions formed Point.In addition, become with the N-shaped root of distribution 122 and p-type distribution 132 being connected with distribution 142a connections with curvature Curve-like.The corner of distribution becomes the starting point of crackle sometimes.When being cracked on distribution, the resistance of distribution becomes larger.Pass through Corner is eliminated, is difficult to crack on distribution, can stably ensure high conversion efficiency.

[embodiment 4]

The back electrode type solar battery cell with distribution piece of embodiment 4 is described as follows referring to the drawings. The points different from embodiment 3 are, make the front end of distribution become curve-like.

Fig. 9 shows a part for the comb-type electrode of distribution piece.Equivalent to the Fig. 3 (a) used in the explanation of embodiment 1 In E parts enlarged drawing.N-shaped distribution 123 and p-type distribution 133 all have by multiple generally trapezoidal parts formed, Front end becomes curve-like.Front end be comparable to trapezoidal parallel with respect to each other. 1 group in, portion while length is short Position.In addition, N-shaped with the root of distribution 123 and p-type distribution 133 with being connected with distribution 143a connections.By eliminating distribution The corner of front end, so as to make to be more difficult to crack on distribution.

[embodiment 5]

The back electrode type solar battery cell with distribution piece of embodiment 5 is described as follows referring to the drawings. The points different from embodiment 3 are, are set in the corner of the front end of distribution cambered.

Figure 10 (a)-Figure 10 (b) shows a part for the comb poles of distribution piece.Figure 10 (a) is equivalent in embodiment 1 Explanation in E parts in Fig. 3 (a) for using enlarged drawing, Figure 10 (b) is the enlarged drawing of the F parts in Figure 10 (a).N-shaped is used Distribution 124 and p-type distribution 134 all have uses distribution 144a connections by multiple generally trapezoidal parts formed, root with being connected. There is the construction of radian as the corner of front end in the present embodiment.Arc is set by the corner of the front end in distribution Degree, so that distribution is more difficult to crack.

In addition, in the present embodiment, covered with the flex point of the straight line portion of distribution and curved portion by fixing resin Mode configures fixing resin.Although due to easy stress concentration, there is the tendency for the starting point for easily becoming crackle in flex point, It is to be covered by using fixing resin, so as to further reliably prevent the generation of crackle.This is because by using fixation Distribution is bonded in distribution piece by resin, so as to obtain preventing the deformation in face.

[embodiment 6]

The back electrode type solar cell with distribution piece of embodiment 6 is described as follows referring to the drawings.With reality Apply the different point of mode 1 to be, in the connection of distribution on piece with being provided with opening portion on distribution.

Figure 11 shows a part for the comb poles of distribution piece.Figure 11 is equivalent to using in the explanation of embodiment 1 The enlarged drawing of E parts in Fig. 3 (a).N-shaped distribution 125, p-type distribution 135 and connection are provided with matching somebody with somebody in distribution on piece Line 145a.N-shaped distribution 125, p types N-shaped electrode, the p with back electrode type solar battery cell respectively of distribution 135 Type is electrically and physically connected with electrode.Connection is the adjacent back electrode type that will configure in a column direction with distribution 145a The distribution that solar battery cell is connected to each other.In the present embodiment, in connection with being provided with opening portion 17 on distribution 145a. Opening portion 17 is the round shape of about 500 μm of diameter, is configured on the root of each N-shaped distribution and p-type distribution.By being used in connection Opening portion is set on distribution, so as to make distribution be difficult to crack.

The diameter of opening portion 17 is preferably from about 100 μm~about 600 μm.This is because when smaller than 100 μm be difficult with Clear and definite pattern is formed on line, when bigger than 600 μm, due to connection distribution resistance increase and cause the drop of transfer efficiency It is low.Opening portion may not be circle but ellipticity.In addition, in the present embodiment, although with sawtooth on connection distribution Shape is configured with opening portion, but can also be linearly to configure.

More than, although having carried out specific description to embodiment 1 to embodiment 6, the utility model is simultaneously unlimited Due to this.Above-mentioned 6 embodiments embodiment obtained from disclosed technological means is appropriately combined respectively is also contained in this In the technical scope of utility model.

In addition, this time disclosed embodiment is to illustrate on all points, and the not basis of limited interpretation.Cause This, the technical scope of the utility model is not only to be explained by above-mentioned embodiment, but is defined by the claims.Separately Outside, comprising all changes in the meaning and scope being equal with claim.

Label declaration

1 distribution piece, 2 back electrode type solar battery cells, 11 insulating properties matrix materials, 12 N-shaped distributions, 13 P-type distribution, 14 connection distributions, 16 distributions, 17 opening portions, 21 silicon substrates, 22 antireflection films, 23 p-type impurities expand Scattered region, 24 n-type impurity diffusion zones, 25 passivating films, 26 N-shaped electrodes, 27 p-type electrodes, 31 fixing resins, 32 Attachment, the 100 back electrode type solar battery cells with distribution piece.

Claims (10)

1. A kind of 1. back electrode type solar battery cell with distribution piece, by distribution piece and back electrode type solar cell list Member is formed, it is characterised in that

   The distribution piece has insulating properties matrix material and the distribution of the light receiving side setting in the insulating properties matrix material,

   The back electrode type solar battery cell has silicon substrate and the electrode of the rear side setting in the silicon substrate,

   The distribution is the substantially comb shape with multiple comb sections,

   The electrode configures substantially in parallel with the comb section,

   The width of the root of the comb section is wider than the width of the front end of the comb section.
2. 2. the back electrode type solar battery cell according to claim 1 with distribution piece, wherein,

   The comb section is generally trapezoidal.
3. 3. the back electrode type solar battery cell according to claim 1 or 2 with distribution piece, wherein,

   The root has curve.
4. 4. the back electrode type solar battery cell according to claim 1 or 2 with distribution piece, wherein,

   The front end has curve.
5. 5. the back electrode type solar battery cell according to claim 2 with distribution piece, wherein,

   Set in the corner of the front end of the comb section cambered.
6. 6. the back electrode type solar battery cell according to claim 3 with distribution piece, wherein,

   Fixing resin is configured between the distribution piece and the back electrode type solar battery cell,

   The comb section of the distribution has straight line in the longitudinal direction,

   Fixing resin is configured in a manner of forming the straight line of shape of the distribution and be covered with point of inflexion on a curve by fixing resin.
7. 7. the back electrode type solar battery cell according to claim 4 with distribution piece, wherein,

   Fixing resin is configured between the distribution piece and the back electrode type solar battery cell,

   The comb section of the distribution has straight line in the longitudinal direction,

   Fixing resin is configured in a manner of forming the straight line of shape of the distribution and be covered with point of inflexion on a curve by fixing resin.
8. 8. the back electrode type solar battery cell according to claim 5 with distribution piece, wherein,

   Fixing resin is configured between the distribution piece and the back electrode type solar battery cell,

   The comb section of the distribution has straight line in the longitudinal direction,

   Fixing resin is configured in a manner of forming the straight line of shape of the distribution and be covered with point of inflexion on a curve by fixing resin.
9. 9. the back electrode type solar battery cell according to claim 1 with distribution piece, wherein,

   In the connection of the distribution piece with being provided with opening portion on distribution.
10. 10. the back electrode type solar battery cell according to claim 1 with distribution piece, wherein,

    The electrode has substantially rectangular shape, and the width of short side direction is approximately fixed.