Battery piece without main grid

Abstract

The utility model discloses a main-grid-free battery piece, which comprises a battery piece main body, welding strips are arranged on the battery piece main body at intervals, and grid line electrodes shaped like a Chinese character'gong 'are printed in the intervals of the welding strips; and the short edge of the bow-shaped bending part on the grid line electrode is in contact connection with the welding strip. Each right-angle bending point of the grid line electrode designed in the shape of the Chinese character'gong 'is provided with a short edge which is in contact with the welding strip, so that better electrical performance connection is formed.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation technical field especially relates to a kind of main grid-free cell piece. BACKGROUND

[0002] As an important part of modern energy solution, photovoltaic power generation is the benchmark of green energy praised by the world due to its unique photo-voltaic effect. However, there are significant differences in the manufacturing process of photovoltaic power generation compared to the past today with continuous technological iteration and progress. The main grid-free cell piece technology is a new technology that cancels the main grid and auxiliary grid in the cell piece metal electrode screen printing link and optimizes the width and spacing of the fine grid. This technology reduces the amount of silver paste used and increases the effective light exposure area of the cell piece, achieving the purpose of cost reduction and efficiency improvement. As the main theme of cost reduction and efficiency improvement in the industry today, the main grid-free cell piece manufacturing process has become a must for the industry to progress. Its excellent cost solution highlights are obvious, but similarly, the connection performance between the solder strip and the cell piece is weaker compared to the conventional infrared welding process, which is an objective phenomenon.

[0003] The utility model patent with the prior art publication number CN220374103U discloses a solar cell printing screen, a solar cell and a photovoltaic module, relating to the photovoltaic technology field. The solar cell printing screen has a printing main grid, a printing fine grid and a frame grid line printing pattern. The printing main grid includes a main body segment printing pattern, a first fishhook structure printing pattern and a second fishhook structure printing pattern. The fine grid printing pattern has a first area, which includes: printing fine grids located between the first fishhook structure printing pattern and the second fishhook structure printing pattern and between the edge main body segment printing patterns, and printing fine grids located at the middle position of the second fishhook structure printing pattern. The width of the printing fine grids in the first area is smaller than the width of the frame grid line printing pattern and the printing fine grids in other positions. This application designs different line widths according to different printing positions of the grid line printing pattern, reduces the probability of grid breakage during the printing process, improves the quality of the grid line, and thus improves the yield and photoelectric conversion efficiency of the solar cell. UTILITY MODEL CONTENTS

[0004] The existing main grid-free cell piece technology completely cancels the main grid electrode to achieve the effect of reducing cost. The disadvantage is that the actual contact area between the solder strip and the cell piece is only one point with the auxiliary grid. Under the premise that the solder strip is perpendicular to the auxiliary grid, if the connection effect is not good, it will cause virtual welding at the connection point, affect the collection of current, and cause the power of the module to decrease.

[0005] In order to solve the above technical problems, the utility model adopts the technical scheme: a main grid-free cell piece, including cell piece main part, the interval of cell piece main part is equipped with the welding band, the interval of welding band is printed with the grid line electrode of " arch " character type; the short side of the bending of " arch " character type on the grid line electrode is in contact with the welding band connection. The grid line electrode of " arch " character type design has a short side in contact with the welding band at each right angle bending point, and better electrical performance connection is formed.

[0006] As a further improvement of the utility model, the welding band includes a base band, the base band is wrapped with a tin layer, and the tin layer is fixedly connected with the short side of the bending of " arch " character type on the grid line electrode. The welding band is arranged longitudinally on the cell piece main body to form an upper and lower passage, and the welding band is spaced apart. The grid line electrode is arranged in the interval.

[0007] As a further improvement of the utility model, the grid line electrode is arranged longitudinally in the form of " arch " character type as a whole, covers the surface of the cell piece main body, and guarantees the coverage of the grid line electrode on the surface of the cell piece main body. The grid line electrode of " arch " character type design has a short side in contact with the welding band at each right angle bending point. After the welding band is subjected to high temperature, the tin layer on the surface of the welding band is melted and fused with the short side of the bending of " arch " character type on the grid line electrode to form an alloy connection contact line. The alloy connection area of the contact line is larger, and precise operation is not required, and the processing is more convenient. The contact lines are spaced apart and not connected with each other, are connected by the welding band to form a passage, and the fault of the power supply network on the cell piece is conveniently checked.

[0008] As a further improvement of the utility model, the welding band connects the upper and lower ends of the cell, and different cell piece main bodies can be connected in series by the welding band to form a cell string.

[0009] As a further improvement of the utility model, the cell piece main body is provided with a flexible bearing film for sealing and wrapping the welding band and the grid line electrode on the cell piece main body.

[0010] The utility model has the advantages that the grid line electrode of " arch " character type design has a short side in contact with the welding band at each right angle bending point, guarantees the coverage of the grid line electrode, and forms better electrical performance connection. The contact lines are spaced apart and not connected with each other, the fault of the power supply network on the cell piece is conveniently checked, the alloy connection area of the tin layer on the welding band and the contact line is larger, precise operation is not required, and the processing is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the whole schematic view of the utility model.

[0012] Figure 2 It is the local structure view of the utility model.

[0013] In the drawing, 1 is a cell piece main body, 2 is a grid line electrode, 3 is a welding band, 4 is a contact line, and 5 is a tin layer. DETAILED DESCRIPTION

[0014] Embodiment One: As shown, a no-main grid cell includes a cell body 1, and a solder strip 3 is arranged at intervals on the cell body 1. The "arch" shaped grid line electrode 2 is printed in the interval of the solder strip 3. The short side of the "arch" shaped bending part of the grid line electrode 2 is in contact with the solder strip 3. The "arch" shaped grid line electrode 2 has a short side in contact with the solder strip 3 at each straight angle bending point, forming a better electrical performance connection. Figure 1

[0015] The no-main grid technology is a new technology that cancels the main grid and the auxiliary grid in the screen printing of the cell metal electrode, and optimizes the width and spacing of the fine grid. This technology reduces the amount of silver paste used and increases the effective light exposure area of the cell, achieving the purpose of reducing cost and increasing efficiency.

[0016] According to the characteristics of the no-main grid cell, the design of the printing screen needs to be more precise to ensure the printing accuracy and uniformity of the fine grid lines. The opening size and shape of the screen need to match the width and spacing of the fine grid lines to achieve high-precision printing.

[0017] The screen printing screen for the cell usually uses stainless steel screen or nickel screen. Stainless steel screen has high hardness and strong corrosion resistance, which is suitable for printing conductive paste. Nickel screen has good elasticity and ductility, which is suitable for printing paste with high viscosity. In the printing of no-main grid cells, the appropriate screen material needs to be selected according to the characteristics of the paste and the printing requirements.

[0018] The thickness of the screen has an important influence on the printing accuracy and speed. In the printing of no-main grid cells, the appropriate thickness of the screen needs to be selected to ensure the printing quality and production efficiency of the fine grid lines. Generally, thinner screens are suitable for printing small conductive grids, while thicker screens are suitable for printing large-area conductive grids.

[0019] The no-main grid technology cancels the main grid and the auxiliary grid, reducing the amount of silver paste used, thereby reducing the manufacturing cost of the cell. At the same time, due to the optimized layout of the fine grid lines, the shading area of the cell is reduced, the light absorption is increased, and the power generation efficiency of the cell is further improved.

[0020] The design of no-main grid optimizes the current transmission path inside the cell, reduces the series resistance, and thus improves the conversion efficiency of the cell. In addition, the no-main grid technology can also improve the anti-cracking ability of the cell and prolong the service life of the cell.

[0021] Grid line electrodes, especially those used in solar panels, are a key component that is mainly made of silver wire mesh or conductive film, used to collect and transmit photoelectric signals.

[0022] ​By increasing the number and density of the grid line electrodes 2, the solar panel can better absorb light, and then convert it into electrical energy. The design of the grid line electrodes can also reduce the reflection of light to some extent, and improve the light absorption rate and conversion efficiency.

[0023] The grid line electrodes can effectively increase the photoelectron transmission efficiency, improve the capture ability of photoelectrons, and thus improve the conversion efficiency of the solar panel.

[0024] The solar panel needs to transmit the absorbed photoelectric energy to the external system through the grid line electrodes. The grid line electrodes 2 can effectively transmit the photoelectric signal to the reflective layer on the back of the panel and the transparent conductive film on the front of the panel, and then to the external load system.

[0025] In order to reduce the loss of electron and hole recombination, the grid line electrodes are usually made of aluminum-silver materials. These materials have good conductivity and corrosion resistance, which can ensure the long-term stability and reliability of the electrodes.

[0026] In the prior art, the grid line electrodes are usually in the form of "comb teeth" to maximize the coverage of the surface of the solar panel while reducing the shading of light. The width of the electrode grid line is generally narrow to increase the light receiving area of the cell and improve the photoelectric conversion efficiency. The grid line electrodes are connected by bus bars to form a complete current collection system. This connection mode ensures that the current in the solar panel can be efficiently transmitted to the external load system. The upper and lower communication solder strips 3 are used as bus bars in this embodiment.

[0027] The existing main grid-free technical solution completely cancels the main grid electrode to achieve the effect of reducing cost. The disadvantage is that the actual contact area of the solder strip 3 with the cell piece is only one point with the sub-grid. If the connection effect is not good, the connection point will cause false welding, affect the collection of current, and cause the power of the assembly to decrease. At the same time, due to the large number of solder joints, it is very inconvenient to troubleshoot and repair.

[0028] As a further improvement of the present application, the present application changes the traditional printing design and changes the screen design. The screen opening interval is adjusted to the electrode distribution of the "bow" type. The "bow" type between different sub-grids forms a contact area with the solder strip 3. Each straight angle bending point of the "bow" type design electrode has an area in contact with the solder strip 3, forming a good electrical performance connection, and is not easy to cause false welding.

[0029] As a further improvement of the present application, as Figure 2As shown, the solder strip 3 includes a base strip wrapped with a tin layer 5, which is fixedly connected with the short side of the "arch" shaped bending part of the grid electrode 2. The solder strip 3 is arranged longitudinally on the battery piece body 1 to form an upper and lower passage, and the grid electrode 2 is arranged in the interval between the solder strips 3.

[0030] As a further improvement of the utility model, the grid electrode 2 is arranged longitudinally in a whole "arch" shape, covering the surface of the battery piece body 1, thereby ensuring the coverage of the grid electrode 2 on the surface of the battery piece body 1. The "arch" shaped grid electrode 2 has a short side in contact with the solder strip 3 at each right-angle bending point. After high-temperature treatment, the tin layer 5 on the surface of the solder strip 3 melts and is in contact with the short side of the "arch" shaped bending part of the grid electrode 2, thereby forming an alloy connected contact line 4. The alloy connection area of the contact line 4 is larger, and precise operation is not required, thereby facilitating processing. The contact lines 4 are spaced apart from each other and are not connected, and are connected by the solder strip 3 to form a passage. When a fault occurs, each can be inspected, thereby facilitating the troubleshooting of the upper power grid network of the battery piece. Large-area alloy connection repair is also simpler and does not require precise processing of individual solder points.

[0031] In embodiment two, a main-grid-free battery piece includes a battery piece body 1, solder strips 3 arranged at intervals on the battery piece body 1, and "arch" shaped grid electrodes 2 printed in the intervals between the solder strips 3. The short side of the "arch" shaped bending part of the grid electrode 2 is in contact with the solder strip 3. The "arch" shaped grid electrode 2 has a short side in contact with the solder strip 3 at each right-angle bending point, thereby forming a better electrical performance connection.

[0032] The main-grid-free technology is a new technology that cancels the main grid and the auxiliary grid in the battery piece metal electrode screen printing link and optimizes the width and spacing of the fine grid. This technology reduces the amount of silver paste used and increases the effective illumination area of the battery piece, thereby achieving the purpose of cost reduction and efficiency improvement.

[0033] According to the characteristics of the main-grid-free battery piece, the design of the printing screen needs to be more precise to ensure the printing accuracy and uniformity of the fine grid lines. The opening size and shape of the screen need to match the width and spacing of the fine grid lines to achieve high-precision printing.

[0034] The battery piece screen printing screen usually uses stainless steel screen or nickel screen. Stainless steel screen has high hardness and strong corrosion resistance, and is suitable for printing conductive paste. Nickel screen has good elasticity and ductility, and is suitable for printing paste with high viscosity. In the printing of main-grid-free battery pieces, the appropriate screen material needs to be selected according to the characteristics of the paste and the printing requirements.

[0035] The thickness of the screen has a significant impact on the printing accuracy and speed. In the printing of non-main grid solar cells, it is necessary to select an appropriate screen thickness to ensure the printing quality and production efficiency of the fine grid lines. Generally, thinner screens are suitable for printing small conductive grids, while thicker screens are suitable for printing large-area conductive grids.

[0036] The non-main grid technology reduces the amount of silver paste used by eliminating the main and secondary grids, thereby reducing the manufacturing cost of the solar cell. At the same time, due to the optimized layout of the fine grid lines, the light-shielding area of the solar cell is reduced, improving the light absorption and further improving the power generation efficiency of the solar cell.

[0037] The design of the non-main grid optimizes the current transmission path inside the solar cell, reduces the series resistance, and thus improves the conversion efficiency of the solar cell. In addition, the non-main grid technology can also improve the anti-cracking ability of the solar cell and prolong the service life of the solar cell.

[0038] The grid line electrode, especially the one used in solar panels, is a key component made of silver wire mesh or conductive film, which is used to collect and transmit photoelectric signals.

[0039] By increasing the number and density of grid line electrodes, solar panels can better absorb light, thereby converting it into electrical energy. The design of the grid line electrode can also reduce light reflection to some extent, improving light absorption and conversion efficiency.

[0040] The grid line electrode can effectively increase the transmission efficiency of photoelectrons and improve the capture ability of photoelectrons, thereby improving the conversion efficiency of solar panels.

[0041] Solar panels need to transfer the absorbed photoelectric energy to the external system through the grid line electrode. The grid line electrode can effectively transfer the photoelectric signal to the reflective layer on the back of the solar panel and the transparent conductive film on the front of the solar panel, and then to the external load system.

[0042] In order to reduce the loss of electron and hole recombination, the grid line electrode is usually made of aluminum-silver material. These materials have good electrical conductivity and corrosion resistance, which can ensure the long-term stability and reliability of the electrode.

[0043] In the prior art, the grid line electrode is usually in the form of "comb teeth" to maximize the coverage of the surface of the solar panel while reducing the shading of light. The width of the electrode grid line is generally narrow to increase the light-receiving area of the cell and improve the photoelectric conversion efficiency. The grid line electrode is connected by a busbar to form a complete current collection system. This connection ensures that the current in the solar panel can be efficiently transmitted to the external load system. The upper and lower communication solder strip 3 in this embodiment serves as a busbar.

[0044] The existing main grid-free technical scheme cancels the main grid electrode to reduce the cost, and the actual contact area between the solder strip 3 and the battery piece is only one point with the auxiliary grid.

[0045] As a further improvement of the utility model, the utility model changes the traditional printing design and the screen design, the electrode distribution of the "arch" type interval of the screen opening is adjusted, the "arch" type between different auxiliary grids forms the contact area with the solder strip 3 and is interlaced with each other.The electrode of the "arch" type design has an area in contact with the solder strip 3 at each right-angle bending point, and better electrical performance connection is formed, and false welding is not easy to cause.

[0046] As a further improvement of the utility model, as shown in Figure 2 The solder strip 3 includes a base strip, the base strip is wrapped with a tin layer 5, and the tin layer 5 is fixedly connected with the short side of the "arch" type bending part of the grid line electrode 2.The solder strip 3 is arranged longitudinally on the battery piece main body 1 to form an upper and lower passage, and the solder strip 3 is spaced apart from each other, and the grid line electrode 2 is arranged in the space.

[0047] As a further improvement of the utility model, the grid line electrode 2 is arranged longitudinally in the "arch" type as a whole, covers the surface of the battery piece main body 1, and guarantees the coverage of the grid line electrode 2 on the surface of the battery piece main body 1; each right-angle bending point of the grid line electrode 2 designed in the "arch" type has a short side in contact with the solder strip 3.The tin layer 5 on the surface of the solder strip 3 is melted after high-temperature treatment, contacts and fuses with the short side of the "arch" type bending part of the grid line electrode 2, and forms the contact line 4 connected by alloying.The alloying connection area of the contact line 4 is larger, precise operation is not needed, and processing is more convenient.The contact lines 4 are spaced apart from each other and are not connected, are connected by the solder strip 3 to form a passage, and can be inspected one by one when a fault occurs, so that the fault of the upper power grid of the battery piece is conveniently checked, large-area alloying connection repair is simpler, and precise processing of a single soldering point is not needed.

[0048] As a further improvement of the embodiment, the solder strip 3 connects the upper and lower ends of the battery, and different battery piece main bodies 1 can be connected in series by the solder strip 3 to form a battery string, so that the combination and installation of large-area battery pieces are facilitated.

[0049] As a further improvement of the embodiment, the battery piece main body 1 is provided with a flexible bearing film for sealing and wrapping the solder strip 3 and the grid line electrode 2 on the battery piece main body 1, so that the gap between the solder strip 3 and the surface of the battery piece is not infiltrated by the packaging adhesive film during assembly.

[0050] The contact line 4 contacts the solder strip 3 at each straight angle bending point of the "arch" type designed grid line electrode 2, which ensures that the grid line electrode 2 has sufficient coverage and forms a better electrical performance connection; meanwhile, the contact lines 4 are spaced apart and not connected to each other, which facilitates troubleshooting of the fault of the power-on network on the battery piece; and the alloy connection area between the tin layer 5 on the solder strip 3 and the contact line 4 is larger, so that precise operation is not required and processing is more convenient.

[0051] The above specific embodiments are only the preferred embodiments of the utility model, and do not limit the specific implementation structure and implementation range of the utility model. In fact, some equivalent changes can also be made according to the shape, structure and design purpose of the utility model. Therefore, any equivalent changes made according to the shape, structure and design purpose of the utility model should be included in the protection scope of the utility model, that is, these equivalent changes should be protected by the utility model.

Claims

1. A cell without a main grid, characterized in that, The battery piece body is provided with welding bands at intervals, and the grid line electrodes in the form of "arch" are printed in the intervals between the welding bands.

2. The cell without main grid according to claim 1, characterized in that, The welding band comprises a base band, and a tin layer is wrapped outside the base band.

3. The cell without main grid according to claim 1 or 2, characterized in that, The welding bands are arranged longitudinally on the battery piece body to form upper and lower channels, and the welding bands are left with intervals, and the grid line electrodes are arranged in the intervals.

4. The no-lead grid cell of claim 1, wherein, The grid line electrodes are arranged longitudinally in the form of "arch" and cover the surface of the battery piece body.

5. The no-finger cell sheet according to claim 2, wherein, The tin layer on the surface of the welding band melts after high-temperature treatment and is fused with the short edges of the grid line electrodes at the bending points of the "arch" to form alloyed contact lines.

6. The cell as claimed in claim 5, wherein, The contact lines are separated from each other and connected by the welding bands to form channels.

7. The no-lead grid cell of claim 1, wherein, The welding bands connect the upper and lower ends of the battery, and different battery piece bodies can be connected in series by the welding bands to form a battery string.

8. The no-lead grid cell of claim 1, wherein, The battery piece body is sealed by a flexible bearing film.

Images