CN220710330U - Back contact battery module - Google Patents
Back contact battery module Download PDFInfo
- Publication number
- CN220710330U CN220710330U CN202321808616.2U CN202321808616U CN220710330U CN 220710330 U CN220710330 U CN 220710330U CN 202321808616 U CN202321808616 U CN 202321808616U CN 220710330 U CN220710330 U CN 220710330U
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- CN
- China
- Prior art keywords
- back contact
- contact battery
- battery module
- front plate
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000003466 welding Methods 0.000 claims abstract description 51
- 239000002390 adhesive tape Substances 0.000 claims abstract description 29
- 239000002313 adhesive film Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 229910000679 solder Inorganic materials 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 239000002985 plastic film Substances 0.000 claims description 6
- 229920006255 plastic film Polymers 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 229910000846 In alloy Inorganic materials 0.000 claims description 3
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 3
- 229920003182 Surlyn® Polymers 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 229910052710 silicon Inorganic materials 0.000 abstract description 8
- 239000010703 silicon Substances 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 10
- 238000003475 lamination Methods 0.000 description 4
- 235000012431 wafers Nutrition 0.000 description 4
- 229910001316 Ag alloy Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- QKAJPFXKNNXMIZ-UHFFFAOYSA-N [Bi].[Ag].[Sn] Chemical compound [Bi].[Ag].[Sn] QKAJPFXKNNXMIZ-UHFFFAOYSA-N 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000005357 flat glass Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Abstract
The utility model provides a back contact battery module, which comprises a battery string, a back plate adhesive film and a back plate, wherein the back plate adhesive film and the back plate are sequentially outwards arranged on the back surface of the battery string; a front plate adhesive film and a front plate of the battery string are sequentially outwards arranged on the front surface; the battery string is characterized by comprising a back contact battery piece, and a welding strip and an adhesive tape for fixing the welding strip, wherein the welding strip and the adhesive tape are arranged outside the back surface of the back contact battery piece in sequence. The back contact battery module utilizes the adhesive tape to fix the low-temperature welding tape to interconnect the back contact batteries, thereby not only effectively avoiding the deformation problem of the battery piece caused by high-temperature welding, but also reducing the high-temperature welding process of the welding tape, and having simpler production process and high assembly production yield; meanwhile, the silicon chip is compatible with thinner silicon chips, so that the material cost of the battery end silicon chip is reduced.
Description
Technical Field
The utility model relates to the technical field of solar cells, in particular to a back contact battery module.
Background
A back contact solar cell is a cell in which both the emitter and base contact electrodes are placed on the back side (non-light receiving side) of the cell, the light receiving side of the cell being free of any metal electrode shielding. The back contact battery module is a module packaged by the back contact solar battery, and the metal electrode grid line is not shielded on the front surface of the module, so that the conversion efficiency is high, and the module looks more attractive. In the welding and interconnection process of the back contact battery in the prior art, the battery and the welding strip can be connected with the battery piece only through the high temperature of more than 130 ℃, and as the back contact battery is single-sided welding, the welding strip has great stress after welding, so that the battery piece is greatly deformed. The deformation of the welded battery plate has the following problems: (1) the battery piece is welded and laminated after the procedures of converging, laying and the like, the deformed and bent battery piece is required to be forcedly flattened in the process, the battery piece has great hidden cracking risk, and meanwhile, a welding strip is easily led out to fall off from a main grid line to cause poor contact, so that the yield of a back contact battery assembly is reduced; (2) the deformation amount of the welded battery piece is directly related to the thickness of the silicon wafer, and the deformation amount of the welded battery piece is larger, so that the hidden crack risk is larger, the welding process seriously affects the space for thinning the thickness of the silicon wafer, and the cost reduction space of the battery piece is affected. Therefore, the prior art has shortcomings.
Disclosure of Invention
In order to solve the problems, the utility model provides a back contact battery module, which uses an adhesive tape to fix a low-temperature welding belt to interconnect back contact batteries, thereby not only effectively avoiding the problem of deformation of battery pieces caused by high-temperature welding, but also reducing the high-temperature welding process of the welding belt, and having simpler production process and high assembly production yield.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the back contact battery module comprises a battery string, a back plate adhesive film and a back plate, wherein the back plate adhesive film and the back plate are sequentially outwards arranged on the back surface of the battery string; a front plate adhesive film and a front plate of the battery string are sequentially outwards arranged on the front surface; the battery string is characterized by comprising a back contact battery piece, and a welding strip and an adhesive tape for fixing the welding strip, wherein the welding strip and the adhesive tape are arranged outside the back surface of the back contact battery piece in sequence.
Further, the welding strip is a low-temperature welding strip, and the thickness of the welding strip is 0.1-0.3mm.
Further, the low-temperature welding strip comprises a copper strip layer and a low-melting-point metal layer covered on the surface of the copper strip layer, and the thickness of the low-melting-point metal layer is 5-30um.
Further, the low-melting-point metal layer is one of tin alloy, indium alloy and metal indium, and the melting point of the metal layer is lower than 155 ℃.
Further, the back contact battery is in a main grid structure or a non-main grid structure.
Further, the adhesive tape is a silica gel PET base material adhesive tape, the thickness is 40-150um, and the temperature resistance is more than 200 ℃.
Further, the front plate adhesive film and the back plate adhesive film are one of EVA, surlyn, POE.
Further, the front plate is a flexible front plate or a hard front plate; the flexible front plate is one of a plastic film ETFE, PET, PEN, a transparent PVDF or a transparent composite film of fluorine-containing material; the hard front plate is glass.
Further, the backboard is a flexible backboard or a hard backboard; the flexible backboard is one of a plastic film ETFE, PI, PET, PEN, PVDF or a composite film of fluorine-containing materials; the hard backboard is glass.
According to the back contact battery module, the low-temperature welding strips are fixed by the adhesive tape to interconnect the back contact batteries, so that the problem of deformation of battery pieces caused by high-temperature welding is effectively avoided, the high-temperature welding process of the welding strips is reduced, the production process is simpler, and the production yield of the assembly is high; meanwhile, the silicon chip is compatible with thinner silicon chips, so that the material cost of the battery end silicon chip is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 is a schematic cross-sectional view of a back contact battery module structure provided by the present utility model;
fig. 2 is a schematic diagram of a battery string formed by interconnecting battery pieces of a back contact battery module with adhesive tape fixing welding strips;
fig. 3 is a schematic structural view of a solder strip of the back contact battery module provided by the utility model;
fig. 4 is a schematic cross-sectional view of a back contact battery module structure provided in a comparative example;
fig. 5 is a schematic diagram of a battery string formed by high-temperature welding and interconnection of battery pieces of a back contact battery module provided in a comparative example.
Reference numerals illustrate: a battery string 10; a battery sheet 1; a solder strip 2; copper tape layer 2-1; 2-2 parts of a low-melting-point metal layer; an adhesive tape 3; a back plate 4; a back plate adhesive film 5; a front plate adhesive film 6; a front plate 7.
Detailed Description
For the purpose of the present utility model; the technical scheme and advantages are more clearly understood, and the present utility model is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The utility model provides a back contact battery module, as shown in fig. 1 and 2, which comprises a battery string 10, a back plate adhesive film 5 and a back plate 4, wherein the back surface of the battery string 10 is outwards in sequence; a front plate adhesive film 6 and a front plate 7 which are sequentially outwards arranged on the front surface of the battery string 10; the battery string 10 comprises a back contact battery piece 1, a welding strip 2 and an adhesive tape 3 for fixing the welding strip 2, wherein the welding strip 2 and the adhesive tape 3 are arranged outside the back surface of the back contact battery piece 1 in sequence.
As shown in FIG. 3, the solder strip 2 is a low-temperature solder strip, and has a thickness of 0.1-0.3mm. The low-temperature welding strip 2 comprises a copper strip layer 2-1 and a low-melting-point metal layer 2-2 covered on the surface of the copper strip layer 2-1, wherein the thickness of the low-melting-point metal layer 2-2 is 5-30um. The metal layer is one of tin alloy, indium alloy and metal indium, and the melting point of the metal layer is lower than 155 ℃. The back contact battery is in a main grid structure or a non-main grid structure. The adhesive tape is a silica gel PET base material adhesive tape, the thickness is 40-150um, and the temperature resistance is more than 200 ℃. The front plate adhesive film and the back plate adhesive film are one of EVA, surlyn, POE. The front plate is a flexible front plate or a hard front plate; the flexible front plate is one of a plastic film ETFE, PET, PEN, a transparent PVDF or a transparent composite film of fluorine-containing material; the hard front plate is glass. The backboard is a flexible backboard or a hard backboard; the flexible backboard is one of a plastic film ETFE, PI, PET, PEN, PVDF or a composite film of fluorine-containing materials; the hard backboard is glass.
In order to better understand the technology, the utility model also discloses a manufacturing method of the back contact battery module, and the manufacturing method comprises the following steps:
step1, adhesive tape fixing and interconnecting: a back contact battery sheet 1, a solder tape 2, and an adhesive tape 3 are provided, and the solder tape 2 is adhered and fixed to the back surface of the back contact battery sheet 1 by the adhesive tape 3 to form a battery string 10. Wherein the adhesive tape 3 fixes the welding tape 2 at normal temperature or low temperature, and the temperature is less than 80 ℃; the adhesive force between the adhesive tape 3 and the battery piece 1 after the welding strip 2 is fixed is more than 0.5N.
Step2, typesetting: the backboard 4, the backboard adhesive film 5 and the battery strings 10 which are welded in series are sequentially arranged from bottom to top, and typesetting operation is completed;
step3, confluence and lamination: welding the welding strip 2 on the battery string 10 to the bus bar in a serial and parallel mode to finish the bus operation, and then laying the front plate adhesive film 6 and the front plate glass 7 to finish the lamination operation;
step4, laminating: and bonding the back plate 4, the back plate adhesive film 5, the battery strings 10, the front plate adhesive film 6 and the front plate glass 7 together under the conditions of vacuum, high temperature and pressure to form the battery module. Wherein, lamination process parameters: the temperature corresponding to the high temperature is 140-170 ℃, the vacuum degree corresponding to the vacuum is less than 1000pa, and the pressure corresponding to the pressurization is 1-1.5 atmospheres;
step5, testing;
example 1
Back contact battery module: the back contact battery piece 1 has a thickness of 150um, the welding strip 2 comprises a copper strip layer 2-1, a tin bismuth silver alloy metal layer covered on the surface of the copper strip layer 2-1, the melting point of the tin bismuth silver alloy metal layer is 140 ℃, and the thickness of the tin bismuth silver alloy metal layer is 20um; the total thickness of the welding strip 2 is 0.2mm, and the width is 0.8mm. The adhesive tape 3 is a silica gel-based PET base adhesive tape, the welding tape 2 is fixed under normal temperature, and the adhesive force between the adhesive tape 3 and the battery piece 1 after the welding tape 2 is fixed is 0.6N.
The lamination temperature in Step4 was 155 ℃, the vacuum degree was 100pa, and the pressure corresponding to pressurization was 1 atm;
example 2:
which differs from example 1 in that: the back contact battery sheet 1 provided in Step1 has a thickness of 130um.
Example 3:
which differs from example 1 in that: the back contact battery sheet 1 provided in Step1 has a thickness of 110um.
Example 4:
which differs from example 1 in that: the back contact battery sheet 1 provided in Step1 has a thickness of 90um.
Comparative example 1:
as shown in fig. 4 and 5, the schematic structural view of the back contact battery module of comparative example 1 shows the non-adhesive tape 3. Which differs from example 1 in that: the welding strip 2 is a tin-lead coating coated on the surface of a copper base material, the welding strip 2 is directly welded on the back contact battery piece 1 through a high-temperature welding process to form interconnection, the welding temperature is 170 ℃, and the welding time is 2S;
comparative example 2:
unlike comparative example 1, the back contact battery plate had a thickness of 130um.
Comparative example 3:
unlike comparative example 1, the back contact battery plate had a thickness of 110um.
Comparative tables of index parameters for examples and comparative examples:
in summary, the back contact battery module provided by the utility model utilizes the advantages of small deformation amount and high assembly manufacturing yield after the adhesive tape is fixed and welded, and can be compatible with thinner silicon wafers, so that the material cost of the battery end silicon wafer is reduced.
The above description is illustrative of the preferred embodiment of the present utility model and is not intended to limit the present utility model, but is to be construed as including any modifications, equivalents, and improvements made within the spirit and principles of the present utility model.
Claims (9)
1. A back contact battery module comprises a battery string, a back plate adhesive film and a back plate, wherein the back plate adhesive film and the back plate are sequentially outwards arranged on the back surface of the battery string; a front plate adhesive film and a front plate of the battery string are sequentially outwards arranged on the front surface; the battery string is characterized by comprising a back contact battery piece, and a welding strip and an adhesive tape for fixing the welding strip, wherein the welding strip and the adhesive tape are arranged outside the back surface of the back contact battery piece in sequence.
2. The back contact battery module of claim 1, wherein the solder strip is a low temperature solder strip having a thickness of 0.1-0.3mm.
3. The back contact battery module of claim 2, wherein the low temperature solder strip comprises a copper strip layer and a low melting point metal layer covering the surface of the copper strip layer, and the low melting point metal layer has a thickness of 5-30um.
4. The back contact battery module of claim 3, wherein the low melting point metal layer is one of tin alloy, indium alloy, and indium metal, and the melting point of the metal layer is lower than 155 ℃.
5. The back contact battery module of claim 1, wherein the back contact battery is of a primary grid structure or a non-primary grid structure.
6. The back contact battery module of claim 1, wherein the adhesive tape is a silicone-based PET substrate adhesive tape having a thickness of 40-150um and a temperature resistance of greater than 200 ℃.
7. The back contact battery module of claim 1, wherein the front plate adhesive film and the back plate adhesive film are one of EVA, surlyn, POE.
8. The back contact battery module of claim 1, wherein the front plate is a flexible front plate or a rigid front plate; the flexible front plate is one of a plastic film ETFE, PET, PEN, a transparent PVDF or a transparent composite film of fluorine-containing material; the hard front plate is glass.
9. The back contact battery module of claim 1, wherein the back plate is a flexible back plate or a rigid back plate; the flexible backboard is one of a plastic film ETFE, PI, PET, PEN, PVDF or a composite film of fluorine-containing materials; the hard backboard is glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321808616.2U CN220710330U (en) | 2023-07-11 | 2023-07-11 | Back contact battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321808616.2U CN220710330U (en) | 2023-07-11 | 2023-07-11 | Back contact battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220710330U true CN220710330U (en) | 2024-04-02 |
Family
ID=90445774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321808616.2U Active CN220710330U (en) | 2023-07-11 | 2023-07-11 | Back contact battery module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220710330U (en) |
-
2023
- 2023-07-11 CN CN202321808616.2U patent/CN220710330U/en active Active
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