CN219226303U - Large-size silicon wafer overlapped tile photovoltaic cell - Google Patents

Abstract

The utility model provides a shingled photovoltaic cell of a large-size silicon wafer, which relates to the technical field of photovoltaic cell manufacture and comprises a cell main body, wherein the cell main body comprises a front surface part and a back surface part, and the back surface part is provided with a current transmission part; the current transmission part is communicated with the front part and is used for transmitting current generated by the front part to the back part; the current transmission part comprises a plurality of back main grid lines and a plurality of back auxiliary grid lines; the back auxiliary grid line is used for transmitting the current of the front part to the back main grid line, so that the problem that the bending and warping of the battery plate are overlarge easily when the battery plate is designed in a less cutting way due to the fact that the wet weight of an aluminum back surface field is larger in the prior art is solved; meanwhile, the aluminum back surface field battery has the technical problems that the transmission path is long, the current transmission line loss is high, and the battery efficiency is lower than that of a main current conventional half-piece battery, so that the use effect of the photovoltaic battery is ensured.

Description

Large-size silicon wafer overlapped tile photovoltaic cell

Technical Field

The utility model relates to the technical field of photovoltaic cell manufacturing, in particular to a shingled photovoltaic cell of a large-size silicon wafer.

Background

Photovoltaic cells are a technology that uses the photovoltaic effect of a semiconductor interface to directly convert light energy into electrical energy, because of the absence of a risk of depletion; the device is safe and reliable, has no noise and no pollution emission; the method is not limited by the resource distribution region, and the advantages of the building roof can be utilized; the power can be generated and supplied on site without consuming fuel and erecting a power transmission line; the energy quality is high; the user is easy to accept from emotion; the method has the characteristics of short construction period, short energy acquisition time and the like, and is a core part in a solar power generation system.

In the production process of the photovoltaic cell, the fabricated cell is required to be sliced, in the prior art, the back of the cell is usually deposited with a layer of aluminum film on the back of a silicon wafer by utilizing sputtering and other technologies, and then the aluminum film and the silicon are subjected to heat treatment at 800-1000 ℃ to be alloyed and internally diffused to form a layer of P+ layer doped with high aluminum concentration, so that an aluminum back field is formed; because the wet weight of the aluminum back surface field is large, if the design of fewer cutting of the battery pieces is carried out, the problem that the battery pieces warp too much easily occurs; meanwhile, the aluminum back surface field battery is long in transmission path, high in current transmission line loss, lower in battery efficiency than a main current conventional half-piece battery, and influences the using effect of the photovoltaic battery.

Disclosure of Invention

The utility model aims to provide a large-size silicon wafer overlapped tile photovoltaic cell so as to solve the problem that in the prior art, the bending and warping of a cell are overlarge easily when the cell is designed in a small-cutting way due to the fact that the wet weight of an aluminum back surface field is large; meanwhile, the aluminum back surface field battery has long transmission path, high current transmission line loss and lower battery efficiency than the mainstream conventional half-cell battery, and the technical problem of influencing the using effect of the photovoltaic battery is solved.

The valve pressure test device comprises a battery main body, wherein the battery main body comprises a front surface part and a back surface part, and the back surface part is provided with a current transmission part;

the current transmission part is communicated with the front surface part and is used for transmitting the current generated by the front surface part to the back surface part;

the current transmission part comprises a plurality of back main grid lines and a plurality of back auxiliary grid lines; the back sub-gate line is used for transmitting the current of the front portion to the back main gate line.

With reference to the first possible implementation manner of the first aspect, the present utility model provides a first possible implementation manner of the first aspect, wherein the front surface portion is provided with a front main grid line, and a conductive adhesive is communicated between the front main grid line and the back auxiliary grid line.

With reference to the first aspect, the present utility model provides a second possible implementation manner of the first aspect, where the plurality of back sub-gate lines and the plurality of back main gate lines are perpendicular to each other.

With reference to the first possible implementation manner of the first aspect, the present utility model provides a third possible implementation manner of the first aspect, wherein the back main grid line is welded with a welding strip.

With reference to the third possible implementation manner of the first aspect, the present utility model provides a fourth possible implementation manner of the first aspect, wherein a diameter of the welding strip is between 0.18mm and 0.26 mm.

With reference to the fourth possible implementation manner of the first aspect, the present utility model provides a fifth possible implementation manner of the first aspect, wherein a distance between the end of the solder strip and the conductive adhesive is between 0.5mm and 1.5 mm.

With reference to the fourth possible implementation manner of the first aspect, the present utility model provides a sixth possible implementation manner of the first aspect, wherein a plurality of the back main gate lines are disposed at intervals along a horizontal direction.

With reference to the sixth possible implementation manner of the first aspect, the present utility model provides a seventh possible implementation manner of the first aspect, wherein the conductive adhesive is disposed at an end portion of the back surface portion.

With reference to the seventh possible implementation manner of the first aspect, the present utility model provides an eighth possible implementation manner of the first aspect, where distances between two connected back main gate lines are equal.

With reference to the seventh possible implementation manner of the first aspect, the present utility model provides a ninth possible implementation manner of the first aspect, wherein a plurality of the back main gate lines are flush with the same end in a vertical direction.

The embodiment of the utility model has the following beneficial effects: the solar cell comprises a cell body and a solar cell, wherein the cell body comprises a front surface part and a back surface part, the front surface part is a surface for receiving solar energy, the solar energy is converted into internal current by utilizing the photovoltaic effect of a semiconductor interface, and the back surface part is provided with a current transmission part which is communicated with the front surface part and is used for transmitting current generated by the front surface part to the back surface part; the purpose of collecting electric energy by the battery body can be achieved; meanwhile, the current transmission part comprises a plurality of back main grid lines and a plurality of back auxiliary grid lines; the back auxiliary grid line is used for transmitting the current of the front part to the back main grid line, the current transmission path is that the back auxiliary grid transmits towards the back main grid, and the back main grid is used for collecting the current; compared with a conventional stacked-tile battery transmission path, the transmission path of the back auxiliary gate current can be greatly reduced, and the battery efficiency is improved; meanwhile, the transmission path of the aluminum back place is reduced, so that the concern of warping of the battery piece during the design of less cutting is avoided, and the problem that the battery piece is easy to warp too much in the case of the design of less cutting of the battery piece due to the fact that the wet weight of the aluminum back place is large in the prior art is relieved; meanwhile, the aluminum back surface field battery has the technical problems that the transmission path is long, the current transmission line loss is high, and the battery efficiency is lower than that of a main current conventional half-piece battery, so that the use effect of the photovoltaic battery is ensured.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the related art, the drawings that are required to be used in the description of the embodiments or the related art will be briefly described, and it is apparent that the drawings in the description below are some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic diagram of an internal structure of a current transmission part in a shingled photovoltaic cell of a large-sized silicon wafer according to an embodiment of the present utility model.

Icon: 100-back main gate line; 200-back auxiliary grid lines; 300-conductive adhesive; 400-welding the strip.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Physical quantities in the formulas, unless otherwise noted, are understood to be basic quantities of basic units of the international system of units, or derived quantities derived from the basic quantities by mathematical operations such as multiplication, division, differentiation, or integration.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features. In the description of the present utility model, "plurality" means two or more. In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween. In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 1, the large-size silicon wafer stacked-tile photovoltaic cell provided by the embodiment of the utility model comprises a cell main body, wherein the cell main body comprises a front surface part and a back surface part, and the back surface part is provided with a current transmission part;

the current transmission part is communicated with the front part and is used for transmitting current generated by the front part to the back part;

the current transmission part includes a plurality of back main gate lines 100 and a plurality of back sub gate lines 200; the back sub-gate line 200 is used to transfer the current of the front portion to the back main gate line 100.

The solar cell comprises a cell body and a solar cell, wherein the cell body comprises a front surface part and a back surface part, the front surface part is a surface for receiving solar energy, the solar energy is converted into internal current by utilizing the photovoltaic effect of a semiconductor interface, and the back surface part is provided with a current transmission part which is communicated with the front surface part and is used for transmitting current generated by the front surface part to the back surface part; the purpose of collecting electric energy by the battery body can be achieved; meanwhile, the current transmission part includes a plurality of back main gate lines 100 and a plurality of back sub gate lines 200; the back sub-gate line 200 is used for transmitting the current of the front portion to the back main gate line 100, and the current transmission path is that the back sub-gate is transmitted towards the back main gate, and the back main gate is used for collecting the current; compared with a conventional stacked-tile battery transmission path, the transmission path of the back auxiliary gate current can be greatly reduced, and the battery efficiency is improved; meanwhile, the transmission path of the aluminum back place is reduced, so that the concern of warping of the battery piece during the design of less cutting is avoided, and the problem that the battery piece is easy to warp too much in the case of the design of less cutting of the battery piece due to the fact that the wet weight of the aluminum back place is large in the prior art is relieved; meanwhile, the aluminum back surface field battery has the technical problems that the transmission path is long, the current transmission line loss is high, and the battery efficiency is lower than that of a main current conventional half-piece battery, so that the use effect of the photovoltaic battery is ensured.

By adding the back main gate line 100 and the back sub gate line 200 to the back portion of the battery body, the current transmission path is the back sub gate line 200 transmitting current to the back main gate line 100, and the back main gate line 100 collects current; compared with the conventional shingle battery transmission path, the back auxiliary grid line 200 current transmission path is reduced by 75% -85%, and the battery efficiency can be improved by 0.1% -0.2%.

Further, a front main grid line is arranged on the front portion, and conductive adhesive 300 is communicated between the front main grid line and the back auxiliary grid line 200.

When the front part of the battery body receives solar energy irradiation, current is collected in the front main grid line, the front main grid line can be communicated with the back auxiliary grid line 200 through the conductive adhesive 300, and the conductive adhesive 300 is not only an adhesive with certain conductivity after solidification or drying, but also the volume of the adhesive is contracted due to volatilization of a solvent and solidification of the adhesive in the bonding process, so that conductive particles are in a stable continuous state mutually, and good conductivity is shown; the operation of staff is convenient, when back auxiliary grid line 200 receives the electric current of positive main grid line, because back auxiliary grid line 200 and back main grid line 100 communicate, the electric current after the transmission can collect in back main grid line 100 to the busbar.

Further, the plurality of back sub-gate lines 200 are perpendicular to the plurality of back main gate lines 100.

The back auxiliary grid lines 200 are perpendicular to the back main grid lines 100, so that current distribution of all parts of the back can be guaranteed, and the subsequent cutting of the battery piece is facilitated.

Further, the conductive paste 300 is disposed at an end of the back surface portion.

Since the conductive adhesive cannot be directly connected to the back main grid line 100, the conductive adhesive 300 is disposed at the end of the back portion, so that the back main grid line can effectively utilize the space of the back portion, and the service length of the back main grid line is increased.

Further, the back main gate line 100 is wire-bonded with a bonding pad 400.

The solder strip 400 serves as a connection and bus during the photovoltaic cell production process. The current of the battery piece is led out through the welding process, and the led-out electrode is effectively connected with the junction box in a serial or parallel mode, and meanwhile, the mechanical strength of the main grid line can be improved through the arrangement of the welding strip 400.

Further, the solder strip 400 has a diameter of between 0.18mm and 0.26 mm.

The diameter of the welding strip 400 is set between 0.18mm and 0.26mm, so that the function of the welding strip 400 can be effectively played, meanwhile, the material is saved, and the cost is reduced.

Further, the distance between the end of the solder strip 400 and the conductive paste 300 is between 0.5mm and 1.5 mm.

The distance between the tail end of the welding strip 400 and the conductive adhesive 300 is 0.5-1.5 mm, so that the transmission line loss between the conductive adhesive 300 and the back main grid welding strip 400 can be reduced;

further, the plurality of back main gate lines 100 are oppositely disposed in the horizontal direction.

In this embodiment, the plurality of back main grid lines 100 are oppositely arranged along the horizontal direction, and the distances between adjacent back main grid lines 100 and the corresponding sides are reasonably controlled, so that when the welding strip 400 is welded with the back main grid lines 100, the possibility that the battery body is cracked due to the stress generated by welding is reduced, and the battery body can be better protected from being damaged by the stress.

Further, the distances between the two connected back main gate lines 100 are equal.

The distances between the two back main grid lines 100 are equal through setting, so that the back of the battery body can be uniformly distributed by the back main grid lines 100 with different polarities, the current transmitted by the front part of the battery body can be uniformly collected, the sintering of the battery body caused by overlarge current on the part of the back main grid lines 100 is avoided, and the collecting capacity of the main grid lines to the current on the battery body can be improved.

Further, the same ends of the plurality of back main gate lines 100 in the vertical direction are flush.

The upper ends and the lower ends of the back main grid lines 100 in the vertical direction of the back part of the battery body are designed to be flush, so that the collection of current by each back main grid line 100 can be further ensured, and the current is uniformly distributed on the back part of the battery body.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The shingled photovoltaic cell is characterized by comprising a cell main body, wherein the cell main body comprises a front surface part and a back surface part, and the back surface part is provided with a current transmission part;

the current transmission part is communicated with the front surface part and is used for transmitting the current generated by the front surface part to the back surface part;

the current transmission part comprises a plurality of back main grid lines (100) and a plurality of back auxiliary grid lines (200); the back sub-gate line (200) is used for transmitting the current of the front portion to the back main gate line (100).

2. The large-size silicon wafer shingled photovoltaic cell of claim 1, wherein the front side portion is provided with a front side main grid line, and a conductive adhesive (300) is communicated between the front side main grid line and the back side auxiliary grid line (200).

3. The large-size silicon wafer shingled photovoltaic cell of claim 2, wherein the plurality of back sub-grids (200) are perpendicular to the plurality of back main grids (100).

4. The large-size silicon wafer shingled photovoltaic cell of claim 2, wherein the conductive paste (300) is disposed at an end of the back surface portion.

5. The large size silicon wafer shingled photovoltaic cell of claim 4, wherein the backside main grid line (100) is wire bonded with a solder strip (400).

6. The large size silicon wafer shingled photovoltaic cell of claim 5, wherein the solder strip (400) has a diameter between 0.18mm and 0.26 mm.

7. The large size silicon wafer shingled photovoltaic cell of claim 6, wherein the distance of the ends of the solder strips (400) from the conductive paste (300) is between 0.5mm and 1.5 mm.

8. The large-size silicon wafer shingled photovoltaic cell of claim 1, wherein a plurality of said back main grid lines (100) are arranged at intervals in the horizontal direction.

9. The large silicon wafer shingled photovoltaic cell of claim 8, wherein the distance between two back main grid lines (100) connected are equal.

10. The large silicon wafer shingled photovoltaic cell of claim 8, wherein the same ends of the plurality of back main grid lines (100) in the vertical direction are flush.

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