CN115332382A - Back contact battery and preparation method thereof, and photovoltaic module and preparation method thereof - Google Patents

Abstract

The back contact battery comprises a battery piece, PAD points and insulation points, wherein the battery piece comprises a P area and an N area, the P area and the N area are distributed at intervals along the row direction, the P area on the back surface of the battery piece is provided with a positive electrode grid line extending along the column direction, the N area on the back surface of the battery piece is provided with a negative electrode grid line extending along the column direction, and the PAD points and the insulation points are distributed in an array form on the positive electrode grid line and the negative electrode grid line and are arranged in a staggered mode. The back contact battery provided by the invention has the advantages of simple structure and convenience in leading out current.

Description

A kind of back contact battery and its preparation method and photovoltaic module and its preparation method

technical field

The invention relates to the technical field of photovoltaic modules, in particular to a back contact battery and a preparation method thereof, a photovoltaic module and a preparation method thereof.

Background technique

Back contact (Interdigitated back contact, IBC), its PN junction and electrodes are located on the back of the battery, that is, the electrodes of the emitter and base regions of the IBC battery are on the back, and the front is not blocked by grid lines, which can improve the photoelectric conversion performance and battery efficiency of the battery High, and can be combined with other crystalline silicon technologies to further improve efficiency, with great development potential. However, the electrode design of the IBC battery in the related art is complicated, and it is difficult to derive the current of the battery, which seriously affects the mass production efficiency and cost control.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

For this reason, the embodiment of the present invention proposes a back contact battery, which has the advantages of simple structure and convenient conduction of current.

According to the back contact battery of the embodiment of the present invention, the back contact battery includes a battery sheet, a PAD point and an insulating point, the battery sheet includes a P region and an N region, and the P region and the N region are arranged at intervals along the row direction, The P region on the back of the battery sheet is provided with positive grid lines extending in the column direction, the N area on the back of the battery sheet is provided with negative electrode grid lines extending in the column direction, and a plurality of the PAD points and a plurality of the insulating points are distributed in an array and arranged alternately on the positive grid line and the negative grid line.

The back contact battery according to the embodiment of the present invention has the advantages of simple structure and convenient current extraction.

In some embodiments, the distance between any one of the PAD points and any one of the adjacent insulation points is equal.

According to the method for preparing a back contact battery according to an embodiment of the present invention, the method for preparing a back contact battery includes the following steps: printing grid lines on the back of the battery sheet, the grid lines being printed on the P area and the N area of the battery sheet;

A plurality of PAD points are arranged on the grid line along the extending direction of the grid line, and the PAD points of the P region and the PAD points of the N region are alternately distributed in the extending direction of the gate line;

Insulation points are provided at intervals between the PAD points and any adjacent PAD points in the row and column directions.

In some embodiments, the PAD dots and the insulating dots are screen printed.

According to the method for preparing a photovoltaic module according to an embodiment of the present invention, the method for preparing a photovoltaic module includes the following steps: arranging a plurality of battery sheets along a row direction, and a plurality of the battery sheets form a battery group;

Connect the PAD points of the P regions of the multiple battery slices of the battery pack through the positive interconnection bar, and connect the PAD points of the N zone of the multiple battery slices of the battery pack through the negative electrode interconnection bar;

Arranging a plurality of said battery packs in a column direction, connecting a plurality of said battery packs in parallel through a positive electrode bus bar and a negative electrode bus bar;

A plurality of battery packs are packaged to obtain a photovoltaic module.

In some embodiments, the positive bus bar is arranged on the first side of the battery pack, the negative bus bar is arranged on the opposite side of the first side of the battery pack, and multiple a row of positive interconnection bars, and multiple rows of negative interconnection bars are connected through the negative bus bars.

In some embodiments, one anode interconnection strip connects in series a row of PAD points in the row-up of the P regions of multiple battery slices, and one negative interconnection strip connects the row-up of the N-region of a plurality of battery slices. A row of PAD points are connected in series.

According to the photovoltaic module of the embodiment of the present invention, the photovoltaic module includes a plurality of battery packs, positive bus bars and negative bus bars, the battery pack includes a plurality of battery sheets arranged along the row direction, and the positive grid lines and the negative grid lines are arranged alternately On the back of the battery sheet, the positive grid lines and the negative grid lines are interlaced with PAD points and insulation points, and a plurality of the battery sheets are connected to a plurality of the positive grids through positive interconnection strips and negative interconnection strips. A plurality of lines and a negative grid line, the positive bus bar is connected to a plurality of positive interconnection bars of the battery pack, and the negative bus bar is connected to a plurality of negative interconnection bars of the battery pack.

In some embodiments, the positive interconnection bar connects the multiple PAD points of the plurality of positive grid lines of the battery slices in series, and the negative interconnection bar connects the battery slices in series. The plurality of PAD points of the plurality of negative grid lines arranged upward are connected in series.

In some embodiments, the insulating point separates the positive interconnection bar/negative interconnection bar from the negative gate line/positive gate line.

Description of drawings

Fig. 1 is a schematic diagram of a P region and an N region according to a method for preparing a back contact battery in an embodiment of the present invention.

FIG. 2 is a schematic diagram of grid line positions according to a method for manufacturing a back contact battery in an embodiment of the present invention.

FIG. 3 is a schematic diagram of the positions of PAD points according to the method for preparing a back contact battery in an embodiment of the present invention.

Fig. 4 is a schematic diagram showing the positions of insulating points according to the method for preparing a back contact battery in an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention.

Reference signs: 100, battery sheet; 110, P area; 120, N area; 111, positive grid line; 121, negative grid line; 112, PAD point; 122, insulation point; 130, positive interconnection bar; 140, Negative electrode interconnection bar; 150, positive electrode bus bar; 160, negative electrode bus bar.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

According to the back contact battery of the embodiment of the present invention, as shown in FIGS. The P region 110 on the back of the battery sheet 100 is provided with a positive grid line 111 extending in the column direction, and the N area 120 on the back of the battery sheet 100 is provided with a negative grid line extending in the column direction. The line 121 , a plurality of PAD points 112 and a plurality of insulating points 122 are arranged in an array and alternately arranged on the positive grid line 111 and the negative grid line 121 . The positive grid line 111 and the negative grid line 121 collect current and gather it to the PAD point 112. The PAD point 112 can be connected to the bus bar to facilitate the extraction of current. The insulating point 122 can prevent the bus bar from being connected to the positive grid line 111 and the negative grid line 121 at the same time to avoid Battery short circuit protects the battery. The electrode preparation of the back contact battery does not require processes such as masking and etching, the preparation process is simple, and the production efficiency of the back contact battery is improved.

The back contact battery according to the embodiment of the present invention has the advantages of simple structure and convenient current extraction.

In some embodiments, as shown in FIGS. 1 to 4 , any one PAD point 112 is equidistant from any adjacent insulation point 122 .

Specifically, any PAD point 112 is adjacent to at least one insulating point 122 in the row direction, and at least adjacent to one insulating point 122 in the column direction. The distance between the PAD point 112 and the insulating point 122 is fixed and equal, so that the PAD point 112 and insulating points 122 form a uniformly distributed lattice. PAD points 112 and insulating points 122 together form a rectangular array. The total number of insulating points 122 is equal.

According to the method for preparing a back contact battery according to an embodiment of the present invention, as shown in FIGS. P area 110 and N area 120;

A plurality of PAD points 112 are arranged on the grid line along the extending direction of the grid line, and the PAD points 112 of the P region 110 and the PAD points 112 of the N region 120 are alternately distributed in the extending direction of the grid line;

Insulation dots 122 are provided at intervals between a PAD dot 112 and any adjacent PAD dots 112 in row and column directions.

Specifically, the grid lines are printed on the back of the battery sheet 100 by screen printing, the grid lines extend along the axial direction of the P region 110 and the N region 120 of the battery sheet 100, and the grid lines in the P region 110 are positive grids. Line 111, the grid line in the N region 120 is the negative grid line 121, a plurality of PAD points 112 are arranged on the grid line, the PAD points 112 are arranged at equal intervals, the PAD points 112 of the positive grid line 111 and the PAD points of the negative grid line 121 112 is dislocated, the distance between the insulating point 122 and the PAD point 112 is equal, and the arrangement position of the insulating point 122 on the positive grid line 111 is the same as that of the PAD point 112 on the negative grid line 121 .

In some embodiments, PAD dots 112 and isolation dots 122 are screen printed.

Specifically, the PAD dots 112 are firstly printed by screen printing, and then the insulating dots 122 are printed by screen printing. Printing the PAD dots 112 first can prevent the printing of the insulating dots 122 from affecting the PAD dots 112 .

According to the method for manufacturing a photovoltaic module according to an embodiment of the present invention, the method for manufacturing a photovoltaic module includes the following steps: arranging a plurality of battery sheets 100 along a row direction, and the plurality of battery sheets 100 form a battery group;

Connect the PAD points 112 of the P regions 110 of the plurality of battery slices 100 of the battery pack through the positive interconnection strip 130, and connect the PAD points 112 of the N region 120 of the plurality of battery slices 100 of the battery pack through the negative interconnection strip 140;

Arrange a plurality of battery packs in the column direction, and connect the plurality of battery packs in parallel through the positive bus bar 150 and the negative bus bar 160;

A photovoltaic module is obtained by encapsulating a plurality of battery packs.

Specifically, a plurality of battery slices 100 are arranged along the row direction, the grid line direction of the battery slices 100 coincides with the column direction, and the plurality of battery slices 100 are connected to a plurality of PAD points 112 along the row direction through the positive electrode interconnection bar 130 The positive grid lines 111 of the plurality of battery slices 100 are connected in series, and the plurality of battery slices 100 are connected to a plurality of PAD points 112 along the row direction through the negative interconnection bar 140 to connect the negative grid lines 121 of the plurality of battery slices 100 in series. The battery sheet 100 is connected to form a battery pack through the positive interconnection strip 130 and the negative interconnection strip 140, the number of the positive interconnection strip 130 is the same as the number of PAD points 112 on the positive grid line 111, and the number of the negative interconnection strip 140 is the same as The number of PAD points 112 on the negative gate line 121 is the same. A plurality of battery packs are arranged in the column direction, a plurality of positive interconnection bars 130 of the plurality of battery packs are connected to the positive bus bar 150, and a plurality of negative interconnection bars 140 and the negative bus bar 160 make the plurality of battery packs connected in parallel. Parallel connection of multiple battery packs can prevent the damage of a single battery pack from affecting the entire photovoltaic module. A plurality of battery packs, positive bus bars 150 and negative bus bars 160 are packaged with packaging materials to form a photovoltaic module, which reduces the difficulty of packaging. Multiple battery slices 100 of a battery pack are connected in series to facilitate one-time welding of the PAD points 112 of the battery slices 100, further improving manufacturing efficiency.

In some embodiments, as shown in FIG. 5 , the positive bus bar 150 is arranged on the first side of the battery pack, the negative bus bar 160 is arranged on the opposite side of the first side of the battery pack, and multiple rows are connected through the positive bus bar 150 The positive interconnection bar 130 is connected to multiple rows of negative interconnection bars 140 through the negative bus bar 160 . The first side of the battery group is the edge side of the battery sheet 100 where the positive grid line 111 is located in the P region 110, and the opposite side of the first side of the battery group is the negative electrode grid line 121 of the N region 120 at the edge of the battery sheet 100. side.

Specifically, the positive bus bar 150 is arranged on the first side of the battery pack, and the positive bus bar 150 is connected to one end of multiple rows of positive interconnection bars 130. In order to prevent the positive bus bar 150 and the negative bus bar 160 from interfering with each other, the negative bus bar The bar 160 is disposed on the opposite side of the first side of the battery pack, and the negative bus bar 160 is connected to one end of the rows of negative interconnection bars 140 away from the first side,

In some embodiments, as shown in FIG. 5 , a positive interconnection bar 130 connects in series a row of PAD points 112 in the P region 110 of multiple battery slices 100 , and a negative interconnection bar 140 connects a plurality of battery cells 100 in series. The row-up row of PAD points 112 of the N-region 120 of the chip 100 is connected in series.

Specifically, a positive interconnection strip 130 extends along the direction of the row and connects the PAD points 112 of the positive grid lines 111 of the multiple P regions 110 of each cell 100 in the row upward. At this time, a positive interconnection strip 130 will Connect the positive grid lines 111 of the P regions 110 of multiple battery slices 100 in series, and one end of a positive electrode interconnection strip 130 is connected from the P zone 110 of the first and last two battery slices 100 of the battery slice 100 group to the P at the edge of the battery slice 100. The area 110 begins to extend along the row direction, and finally extends to connect with the positive electrode bus bar 150. Similarly, one end of the negative pressure interconnection bar is located at the edge of the battery sheet 100 in the N area 120 of the first and last two battery sheets 100 of the battery sheet 100 group. The N region 120 starts to extend along the row direction and finally extends to connect with the negative electrode bus bar 160 .

According to the photovoltaic module of the embodiment of the present invention, as shown in Figure 5, the photovoltaic module includes a plurality of battery packs, positive bus bars 150 and negative bus bars 160, the battery pack includes a plurality of battery sheets 100 arranged along the row direction, and the positive grid Lines 111 and negative grid lines 121 are alternately arranged on the back of the battery sheet 100, and both positive grid lines 111 and negative grid lines 121 are alternately provided with PAD points 112 and insulation points 122. The interconnection bar 140 is connected to a plurality of positive grid lines 111 and negative grid lines 121, the positive bus bar 150 is connected to the positive interconnection bars 130 of a plurality of battery packs, and the negative bus bar 160 is connected to the negative interconnection bars 140 of a plurality of battery packs. .

Specifically, there is an interval between the PAD point 112 of the positive grid line 111 and the PAD point 112 of the adjacent negative grid line 121 in the column upward projection, and the insulation point 122 of the positive grid line 111 is insulated from the insulation point 122 of the adjacent negative grid line 121. There are spaces between projections of points 122 up the column. The number of PAD points 112 of the positive grid line 111 is the same as that of the negative grid line 121 . The PAD points 112 and the insulating points 122 jointly form a rectangular lattice on the battery sheet 100 , and any PAD point 112 has at least one adjacent insulating point 122 . The positive bus bar 150 and the negative bus bar 160 extend in the column direction. The battery sheets 100 of the battery pack are arranged along the row direction, and multiple battery packs are arranged along the column direction.

In some embodiments, as shown in FIG. 5 , the positive interconnection bar 130 connects the plurality of PAD points 112 of the plurality of positive grid lines 111 of the cell 100 in series, and the negative interconnection bar 140 connects the cell 100 in series. The plurality of PAD points 112 of the plurality of negative grid lines 121 arranged upwards are connected in series.

Specifically, one end of the positive interconnection bar 130 is connected to the positive bus bar 150, and the other end of the positive interconnection bar 130 extends along the row direction and is connected to the PAD point 112 of a plurality of positive grid lines 111 to form the positive grid line 111 in the battery sheet 100. The positive interconnection bar 130 is connected to a plurality of battery slices 100 to connect the plurality of battery slices 100 in series, one end of the negative electrode interconnection bar 140 is connected to the negative electrode bus bar 160, and the other end of the negative electrode interconnection bar 140 extends along the row direction to connect with multiple battery slices. The PAD points 112 of each negative grid line 121 are connected to form a series connection of the negative grid lines 121 in the cell 100, the negative interconnection bar 140 connects a plurality of battery segments 100 to connect the plurality of battery segments 100 in series, and the plurality of positive electrode interconnection bars 130 A plurality of PAD points 112 on the column direction of the positive grid lines 111 are sequentially connected, so that the connection of the positive grid lines 111 in the battery sheet 100 can more fully avoid the influence of the fracture of the positive grid lines 111, and a plurality of negative interconnection strips 140 connect the negative electrodes A plurality of PAD points 112 in the column direction of the grid lines 121 are sequentially connected, so that the connection of the negative grid lines 121 in the battery sheet 100 can more fully avoid the impact of the negative grid lines 121 being broken.

In some embodiments, as shown in FIG. 5 , the insulating point 122 separates the positive interconnection bar 130 /the negative interconnection bar 140 from the negative gate line 121 /the positive gate line 111 .

Specifically, the insulation point 122 plays the role of insulation, and the insulation point 122 can prevent the positive interconnection strip 130 from contacting the negative grid line 121 when it is connected to the PAD point 112 of the positive grid line 111, so that the battery is short-circuited and protects the battery.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, Unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

As used herein, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. A feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present invention. Those skilled in the art can make changes, modifications, and changes to the above embodiments. Alternatives and modifications are within the protection scope of the present invention.

Claims (10)

1. A back contact battery, comprising:

the cell comprises a P region and an N region, wherein the P region and the N region are distributed at intervals in the row direction, the P region on the back of the cell is provided with a positive electrode grid line extending in the column direction, and the N region on the back of the cell is provided with a negative electrode grid line extending in the column direction;

the insulation structure comprises PAD points and insulation points, wherein the PAD points and the insulation points are distributed on the positive grid line and the negative grid line in an array mode and are arranged in a staggered mode.

2. The back contact battery of claim 1, wherein any one of said PAD points is equidistant from any adjacent one of said insulating points.

3. A preparation method of a back contact battery is characterized by comprising the following steps:

printing grid lines on the back of a battery piece, wherein the grid lines are printed in a P region and an N region of the battery piece;

a plurality of PAD points are arranged on the grid line along the extending direction of the grid line, and the PAD points in the P area and the PAD points in the N area are distributed in a staggered manner in the extending direction of the grid line;

insulating dots are provided at intervals between the PAD dots and any adjacent PAD dots in the row direction and the column direction.

4. The method of making a back contact cell according to claim 3, wherein said PAD dots and said insulating dots are screen printed.

5. A preparation method of a photovoltaic module is characterized by comprising the following steps:

arranging a plurality of battery pieces along the row direction, wherein the battery pieces form a battery pack;

connecting PAD points of P areas of a plurality of battery pieces of the battery pack through a positive electrode interconnecting strip, and connecting PAD points of N areas of the plurality of battery pieces of the battery pack through a negative electrode interconnecting strip;

arranging a plurality of the battery packs in a column direction, and connecting the plurality of the battery packs in parallel through a positive bus bar and a negative bus bar;

and packaging a plurality of battery packs to obtain the photovoltaic module.

6. The method of making a photovoltaic module of claim 5, wherein the positive bus bar is disposed on a first side of the cell stack, the negative bus bar is disposed on an opposite side of the first side of the cell stack, and the plurality of rows of positive interconnect bars are connected by the positive bus bar and the plurality of rows of negative interconnect bars are connected by the negative bus bar.

7. The method according to claim 6, wherein one of the positive electrode interconnection bars connects PAD points in a row of P regions of the plurality of cells in series, and one of the negative electrode interconnection bars connects PAD points in a row of N regions of the plurality of cells in series.

8. A photovoltaic module, comprising:

the battery pack comprises a plurality of battery pieces which are arranged along the row direction, positive grid lines and negative grid lines are arranged on the back surfaces of the battery pieces in a staggered mode, PAD points and insulation points are arranged on the positive grid lines and the negative grid lines in a staggered mode, and the battery pieces are connected with a plurality of positive grid lines and a plurality of negative grid lines through positive interconnection bars and negative interconnection bars;

the positive bus bar is connected with a plurality of positive electrode interconnection bars of the battery pack, and the negative bus bar is connected with a plurality of negative electrode interconnection bars of the battery pack.

9. The photovoltaic module of claim 8, wherein the positive interconnection bar connects a plurality of the PAD points of a plurality of the positive grid lines of the cell piece in series, and the negative interconnection bar connects a plurality of the PAD points of a plurality of the negative grid lines of the cell piece in series.

10. The photovoltaic module of claim 8 wherein the insulating dots separate the positive/negative interconnect stripes from the negative/positive grid lines.

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