CN210837777U - Photovoltaic cell string and photovoltaic module - Google Patents
Photovoltaic cell string and photovoltaic module Download PDFInfo
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- CN210837777U CN210837777U CN201921687920.XU CN201921687920U CN210837777U CN 210837777 U CN210837777 U CN 210837777U CN 201921687920 U CN201921687920 U CN 201921687920U CN 210837777 U CN210837777 U CN 210837777U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The embodiment of the utility model provides a pair of photovoltaic cell cluster and photovoltaic module, this photovoltaic cell cluster includes: a plurality of battery strings; the battery string includes: a plurality of battery slices; the positive main grids of the plurality of battery slices are connected through a first welding strip, and the negative main grids of the plurality of battery slices are connected through a second welding strip, so that the plurality of battery slices are electrically connected in parallel; and the second welding strip of the battery string is connected with the first welding strip of the adjacent battery string, so that the battery strings are electrically connected in series. The embodiment of the utility model provides an in connect the sliced positive pole of battery and the sliced negative pole of battery is connected to the second solder strip through first solder strip, avoid welding the buckle of area between adjacent battery section, reduced the clearance between the battery section, and then increased the unit conversion rate of photovoltaic cell cluster, owing to do not buckle the stress concentration that leads to in addition, can eliminate the latent risk of splitting of photovoltaic cell cluster.
Description
Technical Field
The utility model relates to a solar cell technical field especially relates to a photovoltaic cell cluster and photovoltaic module.
Background
At present, solar cell slices are generally divided into two types, namely a P-type cell and an N-type cell, wherein the front side of the P-type cell is a negative electrode, and the back side of the P-type cell is a positive electrode; the front surface of the N-type battery is a positive electrode, and the back surface of the N-type battery is a negative electrode.
In the prior art, the connection method of the solar cell slices includes the following three methods: 1) and (3) gluing connection, namely, stacking two battery slices together and overlapping for 2 mm. The back main grid lines of the upper battery slices are superposed with the front main grid lines of the lower battery slices, the middle of the upper battery slices is connected with the middle of the lower battery slices by printing conductive adhesive, the essence of the upper battery slices is that the negative electrodes of the battery slices are connected with the positive electrodes, and soft substances are used as current conductors and buffers in the middle of the upper battery slices; 2) the welding strip is connected, wherein the welding strip is connected with the battery slices in two modes, one mode is that a slice interval exists between the battery slices when the plate type is designed, the welding strip is used for connecting the positive pole and the negative pole of the battery slices, the other mode also exists, the welding strip is bent (conventional welding technology), a main grid line on the front side of the battery slices is connected with a main grid line on the back side of the battery slices through the welding strip, the other mode is that the two welding strips are connected in sections (splicing technology), the upper welding strip is connected with the upper battery slices, the lower welding strip is connected with the lower battery slices, and the two welding strips are welded at the gaps between the battery slices and the battery slices; the other mode is similar to the first mode of connecting the battery slices in a gluing mode, the two battery slices are stacked together and overlapped for 0-2 mm, the back main grid line of the upper battery slice is overlapped with the front main grid line of the lower battery, the middle part of the upper battery slice is connected by a welding strip, the welding strip is connected to the back main grid of the lower battery slice from the front main grid of the lower battery slice, and the essence of the welding strip connection is that the negative electrode of the battery slice is connected with the positive electrode; 3) the back contact type battery slices collect the positive and negative electrodes of the battery slices to the back surface, and then collect current in the modes of a current conducting plate and the like.
In summary, the conventional design usually uses the positive electrodes of the battery slices to connect with the negative electrodes of the battery slices to collect current, and in short, the battery slices are electrically connected in series to form a battery string. However, the prior art has the following problems:
referring to fig. 1, conventionally, a welding strip B is used to connect a positive electrode and a negative electrode of a battery slice a, the welding strip B is connected to a lower main grid of the battery slice a through an upper main grid of the battery slice a, and in the case of a slice spacing, the welding strip is bent to reduce the hidden crack of the battery slice, wherein the welding strip is made of a hard material, and if the welding strip is not bent, the hidden crack is caused on a contact part between the battery slice and the welding strip through rigidity in the process of connecting the upper part of the battery slice to the lower part. The welding strip is used for connecting the battery slices, so that the welding strip bending is certainly caused, the welding strip bending must be in the point that the welding strip is required to be used for connecting the positive electrode and the negative electrode (the positive electrode and the negative electrode are on different surfaces) of the battery slices, the slice gaps must exist and cannot be too small under the bending condition, and the unit conversion rate of the solar battery assembly is reduced due to the fact that large gaps exist among the battery slices.
SUMMERY OF THE UTILITY MODEL
The utility model provides a photovoltaic cell cluster to solve current battery section because the too big unit conversion rate that reduces the photovoltaic cell cluster in clearance in welding process.
An aspect of the utility model provides a photovoltaic cell cluster, include: a plurality of battery strings; the battery string includes: a plurality of battery slices;
the positive main grids of the plurality of battery slices are connected through a first welding strip, and the negative main grids of the plurality of battery slices are connected through a second welding strip, so that the plurality of battery slices are electrically connected in parallel;
and the second welding strip of the battery string is connected with the first welding strip of the adjacent battery string, so that the battery strings are electrically connected in series.
Optionally, the positive main grids of the battery slices are located on the same plane, and the negative main grids of the battery slices are located on the same plane.
Optionally, the distance between adjacent battery slices is 0.2mm-0.4 mm.
Optionally, the cutting direction of the battery slices is parallel to or perpendicular to the positive electrode main grid.
Optionally, the extending direction of the first solder strip is parallel to the extending direction of the positive electrode main grid; the extending direction of the second welding strip is parallel to the extending direction of the negative electrode main grid.
Optionally, the extending direction of the first solder strip is perpendicular to the extending direction of the positive electrode main grid; the extending direction of the second welding strip is perpendicular to the extending direction of the negative electrode main grid.
Optionally, the length of the battery slice is as follows: 150mm-210mm and 25mm-35mm wide.
Optionally, the length of the battery slice is 150mm-210mm, and the width of the battery slice is 150mm-210 mm.
Optionally, the battery slice includes a plurality of positive electrode main grids and a plurality of negative electrode main grids, each positive electrode main grid is arranged in parallel, and each negative electrode main grid is arranged in parallel.
Another aspect of the present invention is to provide a photovoltaic module, including the photovoltaic cell string as described above, further including: the photovoltaic cell string comprises an encapsulation layer covering the outer surface of the photovoltaic cell string and a cover plate layer covering the outer surface of the encapsulation material.
In an embodiment of the present invention, a pair of photovoltaic cell strings is provided, each photovoltaic cell string includes: a plurality of battery strings; the battery string includes: a plurality of battery slices; the positive main grids of the plurality of battery slices are connected through a first welding strip, and the negative main grids of the plurality of battery slices are connected through a second welding strip, so that the plurality of battery slices are electrically connected in parallel; and the second welding strip of the battery string is connected with the first welding strip of the adjacent battery string, so that the battery strings are electrically connected in series. The embodiment of the utility model provides an in connect the sliced positive pole of battery and the sliced negative pole of battery is connected to the second solder strip through first solder strip, avoid welding the buckle of area between adjacent battery section, reduced the clearance between the battery section, and then increased the unit conversion rate of photovoltaic cell cluster, owing to do not buckle the stress concentration that leads to in addition, can eliminate the latent risk of splitting of photovoltaic cell cluster.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic view of a prior art connection of battery slices;
fig. 2 is a schematic diagram of a battery string according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a photovoltaic cell string according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of a photovoltaic cell string according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another photovoltaic cell string provided in the first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a battery slicing and slicing method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another battery slicing and slicing method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
Referring to fig. 2, the utility model provides a one side provides a photovoltaic cell cluster, include: a plurality of battery strings 10; the battery string includes: a plurality of battery slices 11;
the positive main grids of the plurality of battery slices 11 are connected through a first welding strip 12, and the negative main grids of the plurality of battery slices are connected through a second welding strip 13, so that the plurality of battery slices 11 are electrically connected in parallel.
In the embodiment of the present invention, the positive electrode of one battery slice 11 and the positive electrode of the adjacent battery slice 11 are connected, and these two battery slices are in parallel connection state, in the embodiment of the present invention, a plurality of battery slices are in parallel connection state.
In an embodiment of the present invention, a string of cells uses a first solder ribbon and a second solder ribbon.
The embodiment of the utility model provides an in, can have many anodal main bars and many negative poles main bars on the battery section, the current increase problem of bringing for different main bars converge must adopt the busbar to converge, and the embodiment of the utility model provides an use one to weld the area and connect and can save the busbar.
The embodiment of the utility model provides an in between the battery section through parallel connection, interval X between the battery section that reduces that can be very big eliminates and welds the hidden problem of splitting of stress that the area of bending connection brought, reduces the version type of photovoltaic cell cluster, trades for conversion efficiency and promotes.
Referring to fig. 3, the second solder strips of the battery strings are connected to the first solder strips of the adjacent battery strings, so that the battery strings are electrically connected in series.
The embodiment of the utility model provides an in, the second of battery cluster welds area and adjacent the first of battery cluster welds the area and can connect through convex that welds the area, also can connect with wire Y, wherein, uses thin wire to connect, can reduce the distance between the adjacent battery cluster.
Referring to fig. 4, a circuit diagram of the photovoltaic cell string corresponding to fig. 3 is shown, wherein the positive electrodes and the negative electrodes of the cell slices in each cell string are connected, and the negative electrodes and the cell slices are connected to form a parallel electrical connection. Between the battery strings, the positive electrode of one battery string is connected with the negative electrode of the other battery string, so that the battery strings are electrically connected in series.
In the embodiment of the present invention, each sliced positive pole main grid of battery is located the coplanar, and each sliced negative pole main grid of battery is located the coplanar.
The positive electrode main grids of the battery slices are located on the same plane, and the negative electrode main grids of the battery slices are located on the same plane, so that the situation that the battery slices are bent when connected through the first welding strips and the second welding strips can be avoided.
In the embodiment of the present invention, referring to fig. 2, the distance X between adjacent battery slices is 0.2mm to 0.4 mm.
Because no space is reserved for the welding strip between the adjacent battery slices, the gap between the adjacent battery slices is ensured to meet the minimum electrical distance.
In the embodiment of the present invention, referring to fig. 2, the end of the first solder strip 12 close to the first end P1 of the battery string protrudes out of the first end P1 of the battery string; the end of the second solder ribbon 13 near the second end P2 of the battery string protrudes beyond the second end P2 of the battery string.
The embodiment of the utility model provides an in, first welding area and second weld the both ends that the area salient the battery cluster respectively, can make first welding area and second weld the area and connect with another battery cluster.
In the embodiment of the present invention, the cutting direction of the battery slice is parallel or perpendicular to the positive grid line.
Specifically, when the cutting direction of the battery slices is parallel to the main positive grid, referring to fig. 6, the extending direction of the first solder strip 12 is parallel to the extending direction of the main positive grid 111; the extending direction of the second solder strip 13 is parallel to the extending direction of the negative electrode main grid 112.
Referring to fig. 6, a large battery slice is generally 156mm long, 156mm wide and 6mm high, and has a plurality of positive grid lines 12 and a plurality of negative grid lines 13, when the large battery slice is cut along a direction W parallel to the positive grid lines 12, a plurality of small battery slices 11 are obtained, and the small battery slices 11 are connected by a first welding strip and a second welding strip, so that the extension direction of the first welding strip 12 is parallel to the extension direction of the positive main grid 111; the extending direction of the second solder strip 13 is parallel to the extending direction of the negative electrode main grid 112.
In the embodiment of the present invention, when the cutting direction of the battery slices is perpendicular to the main positive grid, refer to fig. 5, where (a) is the negative electrode surface of the battery string and (b) is the positive electrode surface of the battery string; the extending direction of the first solder strip 12 is perpendicular to the extending direction of the positive electrode main grid 111; the extending direction of the second solder strip 13 is perpendicular to the extending direction of the negative electrode main grid 112.
Referring to fig. 7, when a large battery slice is cut along a direction W perpendicular to the positive electrode grid lines 12, a plurality of small battery slices 11 are obtained, the small battery slices 11 are provided with a plurality of positive electrode grid lines and a plurality of negative electrode grid lines, the small battery slices 11 are connected by a first welding strip and a second welding strip, and then the extension direction of the first welding strip 12 is perpendicular to the extension direction of the positive electrode main grid 111; the extending direction of the second solder strip 13 is perpendicular to the extending direction of the negative electrode main grid 112.
In the embodiment of the present invention, the length of the battery slice is: 150mm-210mm and 25mm-35mm wide. Namely, the battery slice 11 is a small battery slice obtained by cutting a large battery slice, and in this way, the current passing through the battery slice 11 can be reduced, and the consumption of the battery slice per se on the electric quantity can be further reduced.
In the embodiment of the utility model, the length of the battery slice is 150mm-210mm, and the width is 150mm-210 mm. The battery slices 11 can also be directly selected to be large battery slices without cutting, and are directly connected through the first welding strip and the second welding strip, so that the slicing process can be reduced.
In the embodiment of the present invention, when the battery slice 11 is a large battery slice with a specification length of 150mm-210mm and a width of 150mm-210mm, the battery slice includes a plurality of positive main grids and a plurality of negative main grids, the plurality of positive main grids are arranged side by side, the plurality of negative main grids are arranged side by side, the plurality of positive main grids can be connected by a first welding strip, and the first welding strip is perpendicular to the plurality of positive main grids; the plurality of negative electrode main grids are connected through a second welding strip, and the second welding strip is perpendicular to the plurality of negative electrode main grids.
In an embodiment of the present invention, a pair of photovoltaic cell strings is provided, each photovoltaic cell string includes: a plurality of battery strings; the battery string includes: a plurality of battery slices; the positive main grids of the plurality of battery slices are connected through a first welding strip, and the negative main grids of the plurality of battery slices are connected through a second welding strip, so that the plurality of battery slices are electrically connected in parallel; and the second welding strip of the battery string is connected with the first welding strip of the adjacent battery string, so that the battery strings are electrically connected in series. The embodiment of the utility model provides an in connect the sliced positive pole of battery and the sliced negative pole of battery is connected to the second solder strip through first solder strip, avoid welding the buckle of area between adjacent battery section, reduced the clearance between the battery section, and then increased the unit conversion rate of photovoltaic cell cluster, owing to do not buckle the stress concentration that leads to in addition, can eliminate the latent risk of splitting of photovoltaic cell cluster.
Example two
Referring to fig. 3, an embodiment of the present invention provides a photovoltaic module, including a photovoltaic cell string according to any one of the embodiments, further including: the photovoltaic cell string comprises an encapsulation layer covering the outer surface of the photovoltaic cell string and a cover plate layer covering the outer surface of the encapsulation material.
In an embodiment of the present invention, the material of the cover plate layer includes glass, a back plate, a metal back plate, an organic cover plate, and the like.
The photovoltaic cell string includes: a plurality of battery strings; the battery string includes: a plurality of battery slices; the positive main grids of the plurality of battery slices are connected through a first welding strip, and the negative main grids of the plurality of battery slices are connected through a second welding strip, so that the plurality of battery slices are electrically connected in parallel; and the second welding strip of the battery string is connected with the first welding strip of the adjacent battery string, so that the battery strings are electrically connected in series.
The embodiment of the utility model provides a photovoltaic module's preparation process is that step 1, cut the battery section into 6 parts 156mm long × 26mm wide little battery sections along the tangent line, step 2, in the stringer, draw earlier the solder strip of being equal length with the battery cluster, place the battery section on the solder strip (positive pole main grid overlaps with the solder strip), draw again the solder strip of being equal length with the battery cluster, place on the negative pole main grid of battery section, step 3, flow the product that step 2 obtained to the stringer and carry out the series welding, step 4, carry out the stromatolite with the product that step 3 obtained, the operation is, utilize the stromatolite template, carry out the series lamination with 60 clusters of battery clusters (glass + packaging material + battery cluster + packaging material + glass), step 5, carry out the lamination with the product that step 4 obtains, step 6, dress frame, dress line box after cooling the product that step 5 obtains.
In an embodiment of the present invention, a photovoltaic module is provided, which includes a photovoltaic cell string as in any one of the embodiments, and further includes: the photovoltaic cell string comprises an encapsulation layer covering the outer surface of the photovoltaic cell string and a cover plate layer covering the outer surface of the encapsulation material. The embodiment of the utility model provides an in photovoltaic cell cluster connect the sliced positive pole of battery and the sliced negative pole of battery is connected to the second solder strip through first solder strip, avoid the solder strip buckle between adjacent battery section, reduced the clearance between the battery section, and then increased photovoltaic module's unit conversion rate, owing to do not buckle the stress concentration that leads to in addition, can eliminate photovoltaic module's latent risk of splitting.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A photovoltaic cell string, comprising: a plurality of battery strings; the battery string includes: a plurality of battery slices;
the positive main grids of the plurality of battery slices are connected through a first welding strip, and the negative main grids of the plurality of battery slices are connected through a second welding strip, so that the plurality of battery slices are electrically connected in parallel;
and the second welding strip of the battery string is connected with the first welding strip of the adjacent battery string, so that the battery strings are electrically connected in series.
2. The string of photovoltaic cells of claim 1, wherein the positive primary grids of each of the slices of cells are located in the same plane and the negative primary grids of each of the slices of cells are located in the same plane.
3. The string of photovoltaic cells of claim 1, wherein the spacing between adjacent slices of cells is between 0.2mm and 0.4 mm.
4. The string of photovoltaic cells of claim 1, wherein the cut direction of the cut pieces of cells is parallel or perpendicular to the positive primary grid.
5. The photovoltaic cell string according to claim 1, wherein an extension direction of the first solder ribbon is parallel to an extension direction of the positive electrode main grid; the extending direction of the second welding strip is parallel to the extending direction of the negative electrode main grid.
6. The photovoltaic cell string according to claim 1, wherein an extension direction of the first solder ribbon is perpendicular to an extension direction of the positive electrode main grid; the extending direction of the second welding strip is perpendicular to the extending direction of the negative electrode main grid.
7. The string of photovoltaic cells of claim 1, wherein the length of the cell slice is: 150mm-210mm and 25mm-35mm wide.
8. The string of photovoltaic cells of claim 1, wherein the cut pieces of cells have a length of 150mm to 210mm and a width of 150mm to 210 mm.
9. The string of photovoltaic cells of claim 8, wherein the slice of cells comprises a plurality of positive primary grids and a plurality of negative primary grids, each of the positive primary grids being juxtaposed and each of the negative primary grids being juxtaposed.
10. A photovoltaic module comprising the string of photovoltaic cells of any of claims 1-9, further comprising: the photovoltaic cell string comprises an encapsulation layer covering the outer surface of the photovoltaic cell string and a cover plate layer covering the outer surface of the encapsulation material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921687920.XU CN210837777U (en) | 2019-10-10 | 2019-10-10 | Photovoltaic cell string and photovoltaic module |
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| CN201921687920.XU CN210837777U (en) | 2019-10-10 | 2019-10-10 | Photovoltaic cell string and photovoltaic module |
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| CN210837777U true CN210837777U (en) | 2020-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510118A (en) * | 2020-12-15 | 2021-03-16 | 东方日升新能源股份有限公司 | Photovoltaic cell slice welding method and photovoltaic cell assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510118A (en) * | 2020-12-15 | 2021-03-16 | 东方日升新能源股份有限公司 | Photovoltaic cell slice welding method and photovoltaic cell assembly |
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