CN220491895U - Metal seed layer structure for stacked gate battery and seed layer printing screen plate - Google Patents
Metal seed layer structure for stacked gate battery and seed layer printing screen plate Download PDFInfo
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- CN220491895U CN220491895U CN202322134798.6U CN202322134798U CN220491895U CN 220491895 U CN220491895 U CN 220491895U CN 202322134798 U CN202322134798 U CN 202322134798U CN 220491895 U CN220491895 U CN 220491895U
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 118
- 239000002184 metal Substances 0.000 title claims abstract description 118
- 238000007639 printing Methods 0.000 title claims abstract description 118
- 238000007650 screen-printing Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 abstract description 25
- 239000000463 material Substances 0.000 abstract description 3
- 229910000510 noble metal Inorganic materials 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 238000003466 welding Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Abstract
The utility model discloses a metal seed layer structure for a stacked gate battery and a seed layer printing screen plate; the metal seed layer is arranged on the surface of the battery piece and is used for collecting current generated in the battery piece; the metal seed layer is composed of a plurality of metal printing points; the metal printing points are sequentially arranged and disconnected with each other to form an intermittent dotted metal seed layer; or a plurality of metal printing points are sequentially arranged and are partially connected with each other to form a linear metal seed layer with the width of the connecting part smaller than that of the metal seed layer. In the metal seed layer structure for the stacked gate battery, the cost can be reduced from various aspects such as slurry, printing screen, process control yield, equipment requirement and the like, particularly the consumption of noble metal slurry can be greatly reduced, and the printing cost is reduced; meanwhile, the screen wire diameter of the consumable material is increased, the yield is improved, the printable times of the printing screen are greatly improved, and the purchase cost and the use cost of the screen are greatly reduced.
Description
Technical Field
The utility model relates to the technical field of photovoltaic cells, in particular to a metal seed layer structure for a stacked gate cell and a printing screen plate for printing and forming the metal seed layer.
Background
The metal patterned electrode of the solar crystalline silicon battery piece mainly plays a role in collecting and transmitting current, the width and height dimensions of the electrode are in micron order, and a large aspect ratio is generally required to reduce the shading of the electrode, and the electrode grid line is required to be uniform and compact so as to reduce the current transmission resistance. The preparation of the patterned electrode is mainly realized through a screen printing process, the screen mesh is of a compact steel wire mesh structure, the area which does not need to be printed is shielded by the isolating film layer, the isolating film layer is removed from the area which needs to be printed to form the electrode pattern, and the micron-sized pattern through which the sizing agent can pass is formed. The mesh number of the screen is 400-550, the wire diameter is 7-10 mu m, the printing line width is 15-30 mu m, the height of the grid line formed by printing is 7-15 mu m, the width of the grid line is about 15-45 mu m, the appearance of the grid line formed by printing is generally fluctuant due to the shielding of the steel wire of the screen cloth, and the smaller the height of the grid line is, the larger the non-uniformity degree of the height is.
With the improvement of battery assembly technology and the increasing demand of cost reduction, the width and the height of the grid line of the battery sheet are required to be smaller and the consumption of slurry is required to be smaller, and under the condition of greatly reducing the consumption of slurry, the continuous and uniform appearance of the grid line is required to be kept, and the wire diameter of the screen plate is required to be as small as possible so as to reduce the non-uniformity of the grid line caused by shielding of the steel wire. Wherein: the screen cost of the 9 mu m wire diameter is 2-3 times of that of the 13 mu m wire diameter, and the screen has small tension and high breakage rate.
In the stacked grid battery technology, the requirements on electrode patterns of battery pieces are much lower than those of a conventional battery, the requirements on printing grid lines are lower, and a screen printing plate with larger line diameter can be used for printing. Although the existing grid cell grid line can be printed by adopting a screen with larger line diameter so as to reduce the manufacturing cost of the printing screen, the consumption of slurry for the existing grid cell grid line structure is still larger, and the cost of the printing screen is reduced, but the cost of the printing slurry is still higher.
Aiming at the problems, a novel grid line structure of the stacked grid battery needs to be designed, so that the consumption of slurry is reduced, and the cost is lowered.
Disclosure of Invention
The utility model aims to design a novel metal seed layer structure for a stacked gate battery, which can greatly reduce the consumption of printing paste and effectively reduce the cost.
The utility model is realized by the following technical scheme:
the metal seed layer structure for the stacked gate battery is characterized in that the metal seed layer is arranged on the surface of a battery piece and is used for collecting current generated in the battery piece;
the metal seed layer is composed of a plurality of metal printing points;
the metal printing points are sequentially arranged and disconnected with each other to form an intermittent dotted metal seed layer;
or, the metal printing points are sequentially arranged and are partially connected with each other to form a linear metal seed layer with the width of the connecting part smaller than that of the connecting part.
Specifically, a wire is further arranged on the metal seed layer, current in the battery piece is led out to the wire through the metal seed layer, and the wire is used for transmitting the current.
According to the utility model, the broken metal seed layer is formed by designing the metal printing points which are disconnected with each other, so that the consumption of slurry can be effectively saved, and the printing cost can be effectively reduced. In addition, in the stacked grid battery technology, the requirements on the electrode patterns of the battery piece are much lower than those of a conventional battery, the requirements on the height-width ratio and the uniformity of a grid line of a metal seed layer for collecting current of the battery piece are lower, even the smaller the height-width ratio is, the better the smaller the height-width ratio is, the collection and the transmission of the current are not affected even if the grid is broken, so that a screen plate with larger line diameter can be used, and the lower requirements on the shape maintenance are met for printing by using paste; the dual cost reduction of printing screens and printing pastes is facilitated.
Further, a metal seed layer structure for a stacked gate cell: the spacing between the metal printing dots disconnected from each other is 10-20 μm.
In the utility model, when the metal seed layer is designed into a virtual line shape, the maximum distance between every two metal printing points is about 10-20 mu m, and the distance has no influence on the photo-generated current collection or the electric energy loss of the battery piece; as the spacing increases further it has a greater impact on the cell current collection and the electrical performance of the assembly.
Further, a metal seed layer structure for a stacked gate cell: the edges of each of the metal printing dots disconnected from each other are rounded in shape.
Further, a metal seed layer structure for a stacked gate cell: the metal printing points are sequentially arranged and are partially connected with each other to form a linear metal seed layer with the width periodically changing.
The metal seed layers with the widths changed periodically are also beneficial to reducing the consumption of slurry and achieving the purpose of reducing the cost.
The printing screen plate for printing to form the metal seed layer is characterized in that the printing screen plate is used for screen printing to form the metal seed layer structure;
the parameters of the printing screen are as follows:
mesh number: 430-600 meshes; wire diameter: 13-23 mu m; yarn thickness: 15-30 mu m; film thickness: 2-7 mu m; the printing line width is 5-10 μm.
The printing screen plate has larger wire diameter, and can reduce the cost of the screen plate. The utility model realizes lower slurry consumption, lower printing height and lower screen cost by optimizing the design of printing screen parameters.
Further, a printing screen for printing a metal seed layer: the printing screen plate is provided with hollowed-out printing positions and non-printing positions; the non-printing position is shielded by a separation film.
Specifically, the utility model designs the printing screen plate with larger design mesh number and steel wire diameter and smaller grooving (printing) line width, so that the slurry quantity which passes through the screen plate and reaches the battery piece is small, and a metal seed layer with a straight line or broken line structure is formed on the battery piece. The metal seed layer structure has the advantages of small slurry amount, difficult stacking and forming, easy slumping and low average height. The metal seed layer structure formed by printing can be well matched with the grid stacking technology and is used for welding wires covered on battery grid lines.
In the novel stacked gate battery technology, the requirement on the metal electrode on the surface of a battery piece is greatly reduced, and the requirements mainly have two points: (1) no large aspect ratio of the electrode is required; (2) The metal electrode is not required to have uniform shape fluctuation and continuous gate breakage. Therefore, the requirements on metal slurry and printing screen can be greatly reduced, and the metal seed layer structure for the stacked gate battery mainly solves the problems: (1) the consumption of the slurry is continuously reduced by the structural optimization design of the metal seed layer, and the cost of the slurry is greatly saved; (2) with the requirement of the traditional battery grid line becoming high, the cost of the traditional printing screen plate is greatly increased, and the metal seed layer structure designed by the utility model can be obtained by using the printing screen plate with larger line diameter, so that the cost of the printing screen plate can be greatly reduced; (3) the existing printed grid line is too high, so that the problem of larger inclination amplitude of a welding wire in the welding process of the battery is caused, and the appearance of the battery is greatly influenced after the welding is finished; the metal seed layer structure designed by the utility model can solve the problem of overhigh grid line and improve the appearance of the battery after welding.
The utility model has the beneficial effects that:
(1) The metal seed layer structure has less consumption of metal slurry, and effectively saves cost; meanwhile, the utility model can adopt screen printing with larger wire diameter, so that the screen printing cost is lower, and the large wire diameter ensures that the screen printing tension is large and the breakage rate is low.
(2) The metal seed layer structure for the stacked gate battery has the advantages that the printing process is consistent with the conventional battery grid line preparation process, any process flow, materials, tooling jigs, equipment, environmental requirements and the like are not required to be changed, and the preparation process condition of the metal seed layer structure is lower and much lower than the conventional battery process requirements, so that any production line for manufacturing conventional batteries at present can be used for directly producing and manufacturing.
(3) In the metal seed layer structure for the stacked gate battery, the cost can be reduced in various aspects such as slurry, printing screen, process control yield, equipment requirement and the like, and the consumption of noble metal slurry can be greatly reduced, so that the printing cost is reduced; meanwhile, the screen wire diameter of the consumable material is increased, the yield is improved, the printable times of the printing screen are greatly improved, and the purchase cost and the use cost of the screen are greatly reduced.
(4) In the metal seed layer structure for the stacked gate battery, the collapse area of the pattern of the metal seed layer structure formed by printing is large, the height is low, the weldable area of the welding wire is large, and the welding is firmer as the welding area is larger; in addition, the height is low, the inclination amplitude of the welding wire is small in the battery welding process, the reflection consistency of the welding wire is high after the photovoltaic module is formed, the appearance consistency of the photovoltaic module is high, and the module is more attractive.
(5) The metal seed layer structure for the stacked gate battery has no high aspect ratio molding requirement, can be compatible with printing slurries with various viscosities and various fluidity, and has lower requirement on the slurries.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a metal seed layer structure for a stacked gate battery according to embodiment 1 of the present utility model;
fig. 2 is a schematic diagram of a metal seed layer structure for a stacked gate battery according to embodiment 2 of the present utility model;
fig. 3 is a partial schematic view of a printing screen.
The marks in the figure: 1 metal seed layer, 2 printing screen, 1-1 metal printing point, 2-1 hollowed-out printing position, 2-2 non-printing position and 2-3 steel wire.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. 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.
Example 1
As shown in fig. 1, a metal seed layer structure for a stacked gate battery is characterized in that a metal seed layer 1 is disposed on a surface of a battery piece, and the metal seed layer 1 is used for collecting current generated in the battery piece;
the metal seed layer 1 is composed of a plurality of metal printing points 1-1, and the metal printing points 1-1 are sequentially arranged and disconnected with each other to form an intermittent dotted metal seed layer 1; wherein: the interval between the metal printing points 1-1 disconnected with each other is set to be 10-20 mu m, and the interval has no influence on the photo-generated current collection or the electric energy loss of the battery piece; when the distance is further increased, the electric performance of the battery piece current collection and photovoltaic module is greatly influenced; the edges of each of the metal printing dots 1-1 disconnected from each other are rounded in shape.
Example 2
As shown in fig. 2, a metal seed layer structure for a stacked gate battery is characterized in that the metal seed layer 1 is disposed on a surface of a battery piece, and the metal seed layer 1 is used for collecting current generated in the battery piece;
the metal seed layer 1 is composed of a plurality of metal printing points 1-1, and the metal printing points 1-1 are sequentially arranged and are partially connected with each other to form a linear metal seed layer 1 with a periodically-changing width; wherein: the width of the connection between adjacent metal printing dots 1-1 is smaller than the width of the metal printing dots 1-1 themselves.
The metal seed layer structures designed in the embodiment 1 and the embodiment 2 can effectively reduce the printing consumption of the metal paste and reduce the cost.
A printing screen 2 for printing to form a metal seed layer structure is provided, and the printing screen 2 is referred to in examples 3 to 6 below.
Example 3
As shown in fig. 3, a printing screen for printing to form a metal seed layer, wherein the printing screen 2 is used for screen printing to form a metal seed layer structure;
the parameters of the printing screen are as follows: mesh number: 480 meshes; wire diameter: 13 μm; yarn thickness: 15 μm; film thickness: 2 μm; printing line width 5 μm; no net knot exists.
The mesh opening of the screen plate is about 46 mu m, slurry can smoothly pass through the screen plate and be adhered to the surface of the battery piece at a slotting position between the steel wire 2-3 and the steel wire 2-3, the slurry can not pass through the screen plate to reach the surface of the battery piece at the position of the steel wire 2-3, the whole graph is in a regular rectangular virtual line shape, and the rectangular edges can spread and collapse to the periphery due to the fluidity of the slurry, so that the shape with round edges is finally formed. When the wire diameter of the steel wire 2-3 is larger or the fluidity of the slurry is low, the finally formed printed pattern is still the broken-line-shaped metal seed layer 1 broken away from each other, as shown in fig. 1; conversely, when the wire diameter of the steel wire 2-3 is small or the slurry fluidity is high, a linear metal seed layer 1 whose width varies periodically may be formed eventually, as shown in fig. 2.
Example 4
The printing screen plate for printing to form the metal seed layer is characterized in that the printing screen plate 2 is used for screen printing to form a metal seed layer structure;
the parameters of the printing screen are as follows: mesh number: 600 mesh; wire diameter: 18 μm; yarn thickness: 25 μm; film thickness: 5 μm; printing line width 8 μm; no net knot exists. In the screen structure, only steel wires with vertical slotted patterns are arranged, and no steel wires parallel to the patterns or forming a certain included angle are arranged.
Example 5
The printing screen plate for printing to form the metal seed layer is characterized in that the printing screen plate 2 is used for screen printing to form a metal seed layer structure;
the parameters of the printing screen are as follows: mesh number: 430 mesh; wire diameter: 23 μm; yarn thickness: 30 μm; film thickness: 7 μm; printing line width 10 μm; there is a net knot. In the screen structure, steel wires and a slotting graph form a certain included angle, and the situation that the crossing nodes of the longitudinal steel wires and the transverse steel wires are just in the graph exists, and the situation can still form a linear metal seed layer or an intermittent dotted metal seed layer.
Example 6
The printing screen plate for printing to form the metal seed layer is characterized in that the printing screen plate 2 is used for screen printing to form a metal seed layer structure;
the parameters of the printing screen are as follows: mesh number: 560 mesh; wire diameter: 15 μm; yarn thickness: 20 μm; film thickness: 3 μm; printing line width 9 μm; no net knot exists. In the screen structure, only steel wires with vertical slotted patterns are arranged, and no steel wires parallel to the patterns or forming a certain included angle are arranged.
The core parameters of the screen printing plate mainly comprise yarn thickness, film thickness, yarn mesh number, line diameter and grooving line width, wherein the line width determines the width of a printed pattern, and the line diameter determines the surface uniformity of the printed pattern. In the stacked grid battery technology, the electrode pattern of the battery piece has no requirements on the aspect ratio and the continuity, the pattern can be printed to form a shape with larger height fluctuation, the printing height is expected to be smaller and better, and the situation of tiny grid breakage can be accepted.
The utility model realizes a metal seed layer structure with intermittent micro size, low height-width ratio and lower overall height through the optimal design of the printing screen, and the printing screen is mainly characterized in that the mesh wire diameter and mesh number of the screen are relatively large, the printed metal seed layer structure is in an intermittent dotted line shape, and adjacent printing points are completely disconnected with each other; or the printing paste is in a linear shape with the width periodically changed, and adjacent printing points are connected with each other in a thin and narrow shape, so that the consumption of the printing paste can be effectively saved, and the cost is greatly reduced.
The above-described preferred embodiments of the present utility model are only for illustrating the present utility model, and are not to be construed as limiting the present utility model. Obvious changes and modifications of the utility model, which are introduced by the technical solution of the present utility model, are still within the scope of the present utility model.
Claims (6)
1. The metal seed layer structure for the stacked gate battery is characterized in that the metal seed layer (1) is arranged on the surface of a battery piece, and the metal seed layer (1) is used for collecting current generated in the battery piece;
the metal seed layer (1) is composed of a plurality of metal printing points (1-1);
the metal printing points (1-1) are sequentially arranged and disconnected with each other to form an intermittent dotted metal seed layer (1);
or, the metal printing dots (1-1) are sequentially arranged and are partially connected with each other to form a linear metal seed layer (1) with the width of the connecting part being smaller than the width of the connecting part.
2. A metal seed layer structure for a stacked gate cell as claimed in claim 1, wherein the spacing between the metal printed dots (1-1) disconnected from each other is 10-20 μm.
3. A metal seed layer structure for a stacked gate cell as claimed in claim 1, wherein the edges of each of said metal printed dots (1-1) which are disconnected from each other are rounded in shape.
4. A metal seed layer structure for a stacked gate battery according to claim 1, wherein a plurality of the metal printing dots (1-1) are sequentially arranged and partially connected to each other to form a linear metal seed layer (1) having a periodically varying width.
5. A printing screen for printing to form a metal seed layer, characterized in that the printing screen (2) is used for screen printing to form a metal seed layer structure according to any one of claims 1 to 4;
the parameters of the printing screen are as follows:
mesh number: 430-600 meshes; wire diameter: 13-23 mu m; yarn thickness: 15-30 mu m;
film thickness: 2-7 mu m; the printing line width is 5-10 μm.
6. A printing screen for printing to form a metal seed layer according to claim 5, wherein the printing screen has hollowed-out printing sites (2-1) and non-printing sites (2-2); the non-printing position (2-2) is shielded by a isolating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322134798.6U CN220491895U (en) | 2023-08-09 | 2023-08-09 | Metal seed layer structure for stacked gate battery and seed layer printing screen plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322134798.6U CN220491895U (en) | 2023-08-09 | 2023-08-09 | Metal seed layer structure for stacked gate battery and seed layer printing screen plate |
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| Publication Number | Publication Date |
|---|---|
| CN220491895U true CN220491895U (en) | 2024-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322134798.6U Active CN220491895U (en) | 2023-08-09 | 2023-08-09 | Metal seed layer structure for stacked gate battery and seed layer printing screen plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220491895U (en) |
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2023
- 2023-08-09 CN CN202322134798.6U patent/CN220491895U/en active Active
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