Topcon solar cell

Abstract

The utility model relates to the field of solar cells, in particular to a topcon solar cell. Comprising a bottom plate, a battery piece body is placed on the upper surface of the bottom plate, sliding grooves are formed in the two sides of the bottom plate, two sliding blocks are slidably connected to the inner walls of the sliding grooves, vertical plates are fixedly connected to the upper surfaces of the sliding blocks, limiting plates are fixedly connected to the sides, close to the bottom plate, of the vertical plates, and two springs are arranged in the sliding grooves. The two ends of each spring are fixedly connected with the corresponding sliding block and the corresponding sliding groove respectively, the interiors of the sliding grooves are fixedly connected with limiting rods, the limiting rods are slidably connected with the sliding blocks, the arc surfaces of the limiting rods are sleeved with the springs, the sides, close to each other, of the two limiting plates are fixedly connected with protective pads, and the protective pads are rubber pads. The topcon solar cell provided by the utility model has the advantages that the conditions of warping, bending and the like of the cell substrate are reduced, and the production efficiency of a TOPCon cell is improved.

Description

Technical Field

[0001] The utility model relates to the field of solar cell sheets, in particular to a topcon solar cell sheet. Background Art

[0002] In the production process of ordinary solar crystalline silicon cells, a planar PN junction is diffused on the silicon wafer, an anti-reflection film is deposited on its surface, and finally a grid line is printed on the front and a full-sheet back electrode is printed on the back to form a silicon cell. The cells produced by this process all have the same structure, and the packaging can only be done by arranging the module layout in units of cells to obtain the voltage, current and power required by the module layout.

[0003] The prior art includes a utility model with a publication number of CN219321360U, which discloses a solar cell. The patent adopts a stacked P layer and N layer, a positive electrode, and a negative electrode. A through hole is opened in the N layer, and the through hole is filled with an insulating material. The negative electrode is led out from the N layer to one side of the solar cell, and the positive electrode is led out from the P layer through the insulating material in the through hole to one side of the solar cell. The solar cell of the utility model can interconnect the positive electrode and the negative electrode with an electrical connection line as needed to obtain at least one of the required voltage and current, which solves the problem that the solar cell in the prior art is difficult to flexibly obtain the required voltage and current.

[0004] The inventors have discovered in their daily work that in the process of using battery cells, the battery cell substrate is prone to warping and bending after long-term use, and the battery cell manufacturing cost is high and the energy consumption is large.

[0005] Therefore, it is necessary to provide a new topcon solar cell to solve the above technical problems. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a topcon solar cell.

[0007] A topcon solar cell sheet provided by the utility model comprises: a bottom plate, a cell body is placed on the upper surface of the bottom plate, slide grooves are provided on both sides of the bottom plate, two sliders are slidably connected to the inner wall of the slide groove, a vertical plate is fixedly connected to the upper surface of the slider, a side of the vertical plate close to the bottom plate is fixedly connected to a limiting plate, two springs are arranged inside the slide groove, and the two ends of the springs are fixedly connected to the slider and the slide groove respectively.

[0008] The effect achieved by the above components is: when the battery cell body needs to be clamped, pull the limit plate to move, the limit plate drives the vertical plate to move, the vertical plate drives the slider to move, the slider slides on the inner wall of the slide groove, the slider drives the spring to stretch, and then take the battery cell body to move, and then place the battery cell body on the bottom plate, and then release the limit plate, the spring contracts, and the rebound force of the spring drives the limit plate to clamp the battery cell body.

[0009] Preferably, a limiting rod is fixedly connected inside the sliding groove, the limiting rod is slidably connected to the sliding block, and the spring is sleeved on the arc surface of the limiting rod.

[0010] The effect achieved by the above components is that the limiting rod can limit the spring, thereby preventing the spring from being deformed during use, thereby increasing the service life of the spring.

[0011] Preferably, a protective pad is fixedly connected to one side of the two limit plates close to each other, and the protective pad is a rubber pad.

[0012] The effect achieved by the above components is that the protective pad can protect the battery cell body to prevent the battery cell body from being worn during use.

[0013] Preferably, the cross-section of the limiting plate is rectangular, and the limiting plate is a plastic plate.

[0014] The effects achieved by the above components are: the plastic plate is relatively cheap, which can greatly reduce the manufacturing cost.

[0015] Preferably, a front electrode is installed inside the battery cell, a P++ layer is provided on the inner wall of the battery cell, the P++ layer is connected to the front electrode 11, a back electrode is installed on the lower surface of the battery cell, and the battery cell comprises an aluminum oxide passivation layer, a P+ emitter layer, an N-type crystalline silicon, a tunneling silicon dioxide layer, a phosphorus-doped Poly-Si and a silicon nitride layer from top to bottom.

[0016] The effects achieved by the above components are: by arranging a silicon oxide tunneling layer and a P-type polysilicon layer on the front side of the substrate to form an N+N++ superimposed aluminum oxide passivation layer, it is possible to reduce the situation where the substrate is subjected to high temperature and high stress accumulation and cannot be released, and reduce the warping and bending of the cell substrate, and improve the efficiency of TOPCon battery production; the tunneling layer and polysilicon layer of this structure can use one device to realize the integrated formation of two film layers, reduce equipment cost investment, improve production efficiency, and can reduce the energy consumption caused by high temperature, thereby saving a certain amount of energy; reducing the situation where the TOPCon battery is naturally released during the energy conversion process, to a certain extent, the energy conversion rate of the TOPCon battery can be improved.

[0017] Preferably, both the upper and lower sides of the battery cell body are silicon nitride layers.

[0018] Compared with the related art, the topcon solar cell provided by the utility model has the following beneficial effects:

[0019] The utility model provides a topcon solar cell. When the cell body needs to be clamped, the limit plate is pulled to move, the limit plate drives the vertical plate to move, the vertical plate drives the slider to move, the slider slides on the inner wall of the slide groove, the slider drives the spring to stretch, the limit rod can limit the spring, and then the cell body is taken to move, and then the cell body is placed on the bottom plate, and then the limit plate is released, the spring contracts, and the resilience of the spring drives the limit plate to clamp the cell body, the protective pad can protect the cell body, and a silicon oxide tunneling layer is arranged on the front of the substrate. The N+N++ superimposed aluminum oxide passivation layer is formed with the P-type polysilicon layer, which can reduce the situation where high stress accumulation on the substrate is caused by high temperature and cannot be released, reduce the warping and bending of the battery cell substrate, and improve the efficiency of TOPCon battery production; the tunneling layer and polysilicon layer of this structure can use one device to realize the integrated formation of two film layers, reduce equipment cost investment, improve production efficiency, and can reduce the energy consumption caused by high temperature, thereby saving a certain amount of energy; reducing the natural release of TOPCon batteries during the energy conversion process can improve the energy conversion rate of TOPCon batteries to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a topcon solar cell provided by the utility model;

[0021] Figure 2 for Figure 1 The side structural diagram shown;

[0022] Figure 3 for Figure 2 The enlarged view of point A is shown;

[0023] Figure 4 for Figure 1 A cross-sectional view of the battery cell shown.

[0024] Numbers in the figure: 1. Battery cell body; 11. Front electrode; 12. Silicon nitride layer; 13. Aluminum oxide passivation layer; 14. P+ emitter layer; 15. N-type crystalline silicon; 16. Tunneling silicon dioxide layer; 17. Phosphorus-doped Poly-Si; 18. Back electrode; 2. Bottom plate; 3. Slide groove; 4. Slider; 5. Limit plate; 6. Vertical plate; 7. Spring; 8. Limit rod; 9. Protective pad. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0027] See also Figures 1 to 4A topcon solar cell provided by an embodiment of the utility model comprises: a bottom plate 2, a cell body 1 is placed on the upper surface of the bottom plate 2, slide grooves 3 are provided on both sides of the bottom plate 2, two sliders 4 are slidably connected to the inner wall of the slide groove 3, a vertical plate 6 is fixedly connected to the upper surface of the slider 4, a side of the vertical plate 6 close to the bottom plate 2 is fixedly connected to a limiting plate 5, two springs 7 are arranged inside the slide groove 3, and the two ends of the spring 7 are fixedly connected to the slider 4 and the slide groove 3 respectively. When the battery cell body 1 needs to be clamped, the limit plate 5 is pulled to move, the limit plate 5 drives the vertical plate 6 to move, the vertical plate 6 drives the slider 4 to move, the slider 4 slides on the inner wall of the slide 3, the slider 4 drives the spring 7 to stretch, and then the battery cell body 1 is taken to move, and then the battery cell body 1 is placed on the bottom plate 2, and then the limit plate 5 is released, the spring 7 contracts, and the resilience of the spring 7 drives the limit plate 5 to clamp the battery cell body 1. The interior of the slide 3 is fixedly connected with a limit rod 8, the limit rod 8 is slidably connected with the slider 4, and the spring 7 is sleeved on the arc surface of the limit rod 8. The limit rod 8 can limit the spring 7 to prevent the spring 7 from deforming during use, thereby increasing the service life of the spring 7. The two limit plates 5 are fixedly connected to each other on one side, and the protective pad 9 is a rubber pad. The protective pad 9 can protect the battery cell body 1 to prevent the battery cell body 1 from being worn during use. The cross section of the limit plate 5 is rectangular, and the limit plate 5 is a plastic plate. The plastic board is relatively cheap, which can greatly reduce the manufacturing cost. A front electrode 11 is installed inside the battery cell. A P++ layer is provided on the inner wall of the battery cell. The P++ layer is connected to the front electrode 11. A back electrode 18 is installed on the lower surface of the battery cell. The battery cell is composed of an aluminum oxide passivation layer 13, a P+ emitter layer 14, an N-type crystalline silicon 15, a tunneling silicon dioxide layer 16, a phosphorus-doped Poly-Si 17 and a silicon nitride layer 12 from top to bottom. By arranging a silicon oxide tunneling layer and a P-type polysilicon layer on the front side of the substrate to form an N+N++ superimposed aluminum oxide passivation layer 13, it is possible to reduce the situation where high stress accumulation on the substrate due to high temperature cannot be released, reduce the warping and bending of the cell substrate, and improve the efficiency of TOPCon cell production; the tunneling layer and polysilicon layer of this structure can use one device to realize the integrated formation of two film layers, reduce equipment cost investment, improve production efficiency, and reduce the energy consumption caused by high temperature, thereby saving a certain amount of energy; reducing the situation where the TOPCon battery is naturally released during the energy conversion process, the energy conversion rate of the TOPCon battery can be improved to a certain extent, and the upper and lower sides of the cell body 1 are both silicon nitride layers 12.

[0028] The working principle of a topcon solar cell provided by the utility model is as follows: the utility model provides a topcon solar cell. When the cell body 1 needs to be clamped, the limit plate 5 is pulled to move, the limit plate 5 drives the vertical plate 6 to move, the vertical plate 6 drives the slider 4 to move, the slider 4 slides on the inner wall of the slide groove 3, the slider 4 drives the spring 7 to stretch, the limit rod 8 can limit the spring 7, and then the cell body 1 is taken to move, and then the cell body 1 is placed on the bottom plate 2, and then the limit plate 5 is released, the spring 7 is contracted, and the rebound force of the spring 7 drives the limit plate 5 to clamp the cell body 1, and the protective pad 9 can clamp the cell The main body 1 is protected by arranging a silicon oxide tunneling layer and a P-type polysilicon layer on the front side of the substrate to form an N+N++ superimposed aluminum oxide passivation layer 13, which can reduce the situation where the substrate is subjected to high temperature and high stress accumulation and cannot be released, and reduce the warping and bending of the battery cell substrate, and improve the efficiency of TOPCon battery production; the tunneling layer and polysilicon layer of this structure can use one device to realize the integrated formation of two film layers, reduce equipment cost investment, improve production efficiency, and can reduce the energy consumption caused by high temperature, thereby saving a certain amount of energy; reduce the situation where the TOPCon battery is naturally released during the energy conversion process, and to a certain extent, can improve the energy conversion rate of the TOPCon battery.

[0029] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0030] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A topcon solar cell, characterized in that: include: A base plate (2), a battery cell body (1) is placed on the upper surface of the base plate (2), a slide groove (3) is provided on both sides of the base plate (2), two sliders (4) are slidably connected to the inner wall of the slide groove (3), a vertical plate (6) is fixedly connected to the upper surface of the slider (4), a side of the vertical plate (6) close to the base plate (2) is fixedly connected to a limit plate (5), two springs (7) are arranged inside the slide groove (3), and the two ends of the spring (7) are respectively fixedly connected to the slider (4) and the slide groove (3).

2. A topcon solar cell according to claim 1, characterized in that: A limiting rod (8) is fixedly connected inside the sliding groove (3), the limiting rod (8) is slidably connected to the sliding block (4), and the spring (7) is sleeved on the arc surface of the limiting rod (8).

3. A topcon solar cell according to claim 1, characterized in that: The two limiting plates (5) are fixedly connected to a protective pad (9) on one side close to each other, and the protective pad (9) is a rubber pad.

4. A topcon solar cell according to claim 1, characterized in that: The cross section of the limiting plate (5) is rectangular, and the limiting plate (5) is a plastic plate.

5. A topcon solar cell according to claim 1, characterized in that: A front electrode (11) is installed inside the cell, a P++ layer is arranged on the inner wall of the cell, the P++ layer is connected to the front electrode (11), a back electrode (18) is installed on the lower surface of the cell, and the cell comprises, from top to bottom, an aluminum oxide passivation layer (13), a P+ emission layer (14), an N-type crystalline silicon (15), a tunneling silicon dioxide layer (16), a phosphorus-doped Poly-Si (17), and a silicon nitride layer (12).

6. A topcon solar cell according to claim 1, characterized in that: The upper and lower sides of the cell body (1) are both silicon nitride layers (12).

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